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    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_ctec_NonOperatingExpenseIncomeNet" xml:lang="en">Non Operating Expense Income Net</label>
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    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="lab_ctec_NonOperatingExpenseIncomeNet" xml:lang="en">Non operating expense income net.</label>
    <loc xlink:type="locator" xlink:href="http://xbrl.ifrs.org/taxonomy/2021-03-24/full_ifrs/full_ifrs-cor_2021-03-24.xsd#ifrs-full_IncomeTaxExpenseContinuingOperations" xlink:label="loc_ifrs-full_IncomeTaxExpenseContinuingOperations" />
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2009/role/negatedLabel" xlink:label="lab_ifrs-full_IncomeTaxExpenseContinuingOperations" xml:lang="en">Tax expense (income)</label>
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    <loc xlink:type="locator" xlink:href="http://xbrl.ifrs.org/taxonomy/2021-03-24/full_ifrs/full_ifrs-cor_2021-03-24.xsd#ifrs-full_ResearchAndDevelopmentExpense" xlink:label="loc_ifrs-full_ResearchAndDevelopmentExpense" />
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2009/role/negatedLabel" xlink:label="lab_ifrs-full_ResearchAndDevelopmentExpense" xml:lang="en">Research and development expense</label>
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    <loc xlink:type="locator" xlink:href="http://xbrl.ifrs.org/taxonomy/2021-03-24/full_ifrs/full_ifrs-cor_2021-03-24.xsd#ifrs-full_GeneralAndAdministrativeExpense" xlink:label="loc_ifrs-full_GeneralAndAdministrativeExpense" />
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2009/role/negatedLabel" xlink:label="lab_ifrs-full_GeneralAndAdministrativeExpense" xml:lang="en">General and administrative expense</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ifrs-full_GeneralAndAdministrativeExpense" xlink:to="lab_ifrs-full_GeneralAndAdministrativeExpense" />
    <loc xlink:type="locator" xlink:href="213800LS272L4FIDOH92-2022-12-31.xsd#ctec_OperatingExpensesExcludingCostOfSales" xlink:label="loc_ctec_OperatingExpensesExcludingCostOfSales" />
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_ctec_OperatingExpensesExcludingCostOfSales" xml:lang="en">Operating Expenses Excluding Cost of Sales</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2009/role/negatedLabel" xlink:label="lab_ctec_OperatingExpensesExcludingCostOfSales" xml:lang="en">Operating Expenses Excluding Cost of Sales</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ctec_OperatingExpensesExcludingCostOfSales" xlink:to="lab_ctec_OperatingExpensesExcludingCostOfSales" />
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="lab_ctec_OperatingExpensesExcludingCostOfSales" xml:lang="en">The amount of operating expense excluding the cost of sales. [Refer: Cost of sales].</label>
    <loc xlink:type="locator" xlink:href="http://xbrl.ifrs.org/taxonomy/2021-03-24/full_ifrs/full_ifrs-cor_2021-03-24.xsd#ifrs-full_GrossProfit" xlink:label="loc_ifrs-full_GrossProfit" />
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/totalLabel" xlink:label="lab_ifrs-full_GrossProfit" xml:lang="en">Gross profit</label>
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    <loc xlink:type="locator" xlink:href="http://xbrl.ifrs.org/taxonomy/2021-03-24/full_ifrs/full_ifrs-cor_2021-03-24.xsd#ifrs-full_MiscellaneousOtherOperatingExpense" xlink:label="loc_ifrs-full_MiscellaneousOtherOperatingExpense" />
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2009/role/negatedLabel" xlink:label="lab_ifrs-full_MiscellaneousOtherOperatingExpense" xml:lang="en">Miscellaneous other operating expense</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ifrs-full_MiscellaneousOtherOperatingExpense" xlink:to="lab_ifrs-full_MiscellaneousOtherOperatingExpense" />
    <loc xlink:type="locator" xlink:href="213800LS272L4FIDOH92-2022-12-31.xsd#ctec_OtherComprehensiveIncomeBeforeTaxChangeInPensionAssetRestriction" xlink:label="loc_ctec_OtherComprehensiveIncomeBeforeTaxChangeInPensionAssetRestriction" />
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_ctec_OtherComprehensiveIncomeBeforeTaxChangeInPensionAssetRestriction" xml:lang="en">Other Comprehensive Income Before Tax Change In Pension Asset Restriction</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ctec_OtherComprehensiveIncomeBeforeTaxChangeInPensionAssetRestriction" xlink:to="lab_ctec_OtherComprehensiveIncomeBeforeTaxChangeInPensionAssetRestriction" />
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="lab_ctec_OtherComprehensiveIncomeBeforeTaxChangeInPensionAssetRestriction" xml:lang="en">Other comprehensive income before tax change in pension asset restriction.</label>
    <loc xlink:type="locator" xlink:href="213800LS272L4FIDOH92-2022-12-31.xsd#ctec_RealisationOfCumulativeTranslationAdjustments" xlink:label="loc_ctec_RealisationOfCumulativeTranslationAdjustments" />
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_ctec_RealisationOfCumulativeTranslationAdjustments" xml:lang="en">Realisation Of Cumulative Translation Adjustments</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ctec_RealisationOfCumulativeTranslationAdjustments" xlink:to="lab_ctec_RealisationOfCumulativeTranslationAdjustments" />
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="lab_ctec_RealisationOfCumulativeTranslationAdjustments" xml:lang="en">Realisation of cumulative translation adjustments.</label>
    <loc xlink:type="locator" xlink:href="213800LS272L4FIDOH92-2022-12-31.xsd#ctec_EffectivePortionOfChangesInFairValueOfCashFlowHedges" xlink:label="loc_ctec_EffectivePortionOfChangesInFairValueOfCashFlowHedges" />
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_ctec_EffectivePortionOfChangesInFairValueOfCashFlowHedges" xml:lang="en">Effective Portion Of Changes In Fair Value Of Cash Flow Hedges</label>
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    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="lab_ctec_EffectivePortionOfChangesInFairValueOfCashFlowHedges" xml:lang="en">Effective portion of changes in fair value of cash flow hedges.</label>
    <loc xlink:type="locator" xlink:href="213800LS272L4FIDOH92-2022-12-31.xsd#ctec_CostsOfHedging" xlink:label="loc_ctec_CostsOfHedging" />
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_ctec_CostsOfHedging" xml:lang="en">Costs Of Hedging</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ctec_CostsOfHedging" xlink:to="lab_ctec_CostsOfHedging" />
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="lab_ctec_CostsOfHedging" xml:lang="en">Costs of hedging.</label>
    <loc xlink:type="locator" xlink:href="http://xbrl.ifrs.org/taxonomy/2021-03-24/full_ifrs/full_ifrs-cor_2021-03-24.xsd#ifrs-full_IncomeTaxRelatingToComponentsOfOtherComprehensiveIncomeThatWillBeReclassifiedToProfitOrLoss" xlink:label="loc_ifrs-full_IncomeTaxRelatingToComponentsOfOtherComprehensiveIncomeThatWillBeReclassifiedToProfitOrLoss" />
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2009/role/negatedLabel" xlink:label="lab_ifrs-full_IncomeTaxRelatingToComponentsOfOtherComprehensiveIncomeThatWillBeReclassifiedToProfitOrLoss" xml:lang="en">Income tax relating to components of other comprehensive income that will be reclassified to profit or loss</label>
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    <loc xlink:type="locator" xlink:href="213800LS272L4FIDOH92-2022-12-31.xsd#ctec_InvestmentInFinancialAssets" xlink:label="loc_ctec_InvestmentInFinancialAssets" />
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_ctec_InvestmentInFinancialAssets" xml:lang="en">Investment In Financial Assets</label>
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    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="lab_ctec_InvestmentInFinancialAssets" xml:lang="en">Investment in financial assets.</label>
    <loc xlink:type="locator" xlink:href="http://xbrl.ifrs.org/taxonomy/2021-03-24/full_ifrs/full_ifrs-cor_2021-03-24.xsd#ifrs-full_NetAssetsLiabilities" xlink:label="loc_ifrs-full_NetAssetsLiabilities" />
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/totalLabel" xlink:label="lab_ifrs-full_NetAssetsLiabilities" xml:lang="en">Net assets (liabilities)</label>
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    <loc xlink:type="locator" xlink:href="213800LS272L4FIDOH92-2022-12-31.xsd#ctec_IncreaseDecreaseThroughTransferBetweenIssuedCapitalSharePremiumAndRetainedEarningsEquity" xlink:label="loc_ctec_IncreaseDecreaseThroughTransferBetweenIssuedCapitalSharePremiumAndRetainedEarningsEquity" />
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    <loc xlink:type="locator" xlink:href="http://xbrl.ifrs.org/taxonomy/2021-03-24/full_ifrs/full_ifrs-cor_2021-03-24.xsd#ifrs-full_DecreaseIncreaseThroughTaxOnSharebasedPaymentTransactions" xlink:label="loc_ifrs-full_DecreaseIncreaseThroughTaxOnSharebasedPaymentTransactions" />
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2009/role/negatedLabel" xlink:label="lab_ifrs-full_DecreaseIncreaseThroughTaxOnSharebasedPaymentTransactions" xml:lang="en">Decrease (increase) through tax on share-based payment transactions, equity</label>
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    <loc xlink:type="locator" xlink:href="213800LS272L4FIDOH92-2022-12-31.xsd#ctec_ChangeInPensionAssetRestriction" xlink:label="loc_ctec_ChangeInPensionAssetRestriction" />
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_ctec_ChangeInPensionAssetRestriction" xml:lang="en">Change In Pension Asset Restriction</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ctec_ChangeInPensionAssetRestriction" xlink:to="lab_ctec_ChangeInPensionAssetRestriction" />
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="lab_ctec_ChangeInPensionAssetRestriction" xml:lang="en">Change in pension asset restriction.</label>
    <loc xlink:type="locator" xlink:href="213800LS272L4FIDOH92-2022-12-31.xsd#ctec_RealisationOfCumulativeTranslationAdjustment" xlink:label="loc_ctec_RealisationOfCumulativeTranslationAdjustment" />
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_ctec_RealisationOfCumulativeTranslationAdjustment" xml:lang="en">Realisation Of Cumulative Translation Adjustment</label>
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    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="lab_ctec_RealisationOfCumulativeTranslationAdjustment" xml:lang="en">Realisation of cumulative translation adjustment.</label>
    <loc xlink:type="locator" xlink:href="213800LS272L4FIDOH92-2022-12-31.xsd#ctec_AdjustmentsForDepreciationOfPropertyPlantAndEquipment" xlink:label="loc_ctec_AdjustmentsForDepreciationOfPropertyPlantAndEquipment" />
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_ctec_AdjustmentsForDepreciationOfPropertyPlantAndEquipment" xml:lang="en">Adjustments For Depreciation Of Property Plant And Equipment</label>
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    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="lab_ctec_AdjustmentsForDepreciationOfPropertyPlantAndEquipment" xml:lang="en">Adjustments for depreciation of property plant and equipment.</label>
    <loc xlink:type="locator" xlink:href="213800LS272L4FIDOH92-2022-12-31.xsd#ctec_AdjustmentsForDepreciationOfRightOfUseAssets" xlink:label="loc_ctec_AdjustmentsForDepreciationOfRightOfUseAssets" />
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_ctec_AdjustmentsForDepreciationOfRightOfUseAssets" xml:lang="en">Adjustments For Depreciation Of Right Of Use Assets</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ctec_AdjustmentsForDepreciationOfRightOfUseAssets" xlink:to="lab_ctec_AdjustmentsForDepreciationOfRightOfUseAssets" />
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="lab_ctec_AdjustmentsForDepreciationOfRightOfUseAssets" xml:lang="en">Adjustments for depreciation of right of use assets.</label>
    <loc xlink:type="locator" xlink:href="213800LS272L4FIDOH92-2022-12-31.xsd#ctec_AdjustmentsForNonOperatingExpenseNet" xlink:label="loc_ctec_AdjustmentsForNonOperatingExpenseNet" />
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_ctec_AdjustmentsForNonOperatingExpenseNet" xml:lang="en">Adjustments For Non Operating Expense Net</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ctec_AdjustmentsForNonOperatingExpenseNet" xlink:to="lab_ctec_AdjustmentsForNonOperatingExpenseNet" />
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="lab_ctec_AdjustmentsForNonOperatingExpenseNet" xml:lang="en">Adjustments for non operating expense net.</label>
    <loc xlink:type="locator" xlink:href="http://xbrl.ifrs.org/taxonomy/2021-03-24/full_ifrs/full_ifrs-cor_2021-03-24.xsd#ifrs-full_AdjustmentsForFinanceIncomeCost" xlink:label="loc_ifrs-full_AdjustmentsForFinanceIncomeCost" />
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2009/role/negatedLabel" xlink:label="lab_ifrs-full_AdjustmentsForFinanceIncomeCost" xml:lang="en">Adjustments for finance income (cost)</label>
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    <loc xlink:type="locator" xlink:href="213800LS272L4FIDOH92-2022-12-31.xsd#ctec_AdjustmentsForImpairmentAndWriteOffOfIntangiblesAssets" xlink:label="loc_ctec_AdjustmentsForImpairmentAndWriteOffOfIntangiblesAssets" />
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_ctec_AdjustmentsForImpairmentAndWriteOffOfIntangiblesAssets" xml:lang="en">Adjustments For Impairment And Write Off Of Intangibles Assets</label>
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    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="lab_ctec_AdjustmentsForImpairmentAndWriteOffOfIntangiblesAssets" xml:lang="en">Adjustments for impairment and write-off of intangibles assets.</label>
    <loc xlink:type="locator" xlink:href="213800LS272L4FIDOH92-2022-12-31.xsd#ctec_AdjustmentsForImpairmentAndWriteOffOfPropertyPlantAndEquipment" xlink:label="loc_ctec_AdjustmentsForImpairmentAndWriteOffOfPropertyPlantAndEquipment" />
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_ctec_AdjustmentsForImpairmentAndWriteOffOfPropertyPlantAndEquipment" xml:lang="en">Adjustments For Impairment And Write Off Of Property Plant And Equipment</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ctec_AdjustmentsForImpairmentAndWriteOffOfPropertyPlantAndEquipment" xlink:to="lab_ctec_AdjustmentsForImpairmentAndWriteOffOfPropertyPlantAndEquipment" />
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="lab_ctec_AdjustmentsForImpairmentAndWriteOffOfPropertyPlantAndEquipment" xml:lang="en">Adjustments for impairment and write-off of property, plant and equipment.</label>
    <loc xlink:type="locator" xlink:href="213800LS272L4FIDOH92-2022-12-31.xsd#ctec_AdjustmentsForOtherNonCurrentReceivables" xlink:label="loc_ctec_AdjustmentsForOtherNonCurrentReceivables" />
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_ctec_AdjustmentsForOtherNonCurrentReceivables" xml:lang="en">Adjustments For Other Non Current Receivables</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2009/role/negatedLabel" xlink:label="lab_ctec_AdjustmentsForOtherNonCurrentReceivables" xml:lang="en">Adjustments For Other Non Current Receivables</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ctec_AdjustmentsForOtherNonCurrentReceivables" xlink:to="lab_ctec_AdjustmentsForOtherNonCurrentReceivables" />
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="lab_ctec_AdjustmentsForOtherNonCurrentReceivables" xml:lang="en">Adjustments for other non current receivables.</label>
    <loc xlink:type="locator" xlink:href="213800LS272L4FIDOH92-2022-12-31.xsd#ctec_AdjustmentsForRestrictedCash" xlink:label="loc_ctec_AdjustmentsForRestrictedCash" />
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    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="lab_ctec_AdjustmentsForRestrictedCash" xml:lang="en">Adjustments for restricted cash.</label>
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    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_ctec_AdjustmentsForIncreaseDecreaseInOtherNonCurrentPayables" xml:lang="en">Adjustments For Increase Decrease In Other Non Current Payables</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ctec_AdjustmentsForIncreaseDecreaseInOtherNonCurrentPayables" xlink:to="lab_ctec_AdjustmentsForIncreaseDecreaseInOtherNonCurrentPayables" />
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="lab_ctec_AdjustmentsForIncreaseDecreaseInOtherNonCurrentPayables" xml:lang="en">Adjustments for increase (decrease) in Other non-current payables.</label>
    <loc xlink:type="locator" xlink:href="http://xbrl.ifrs.org/taxonomy/2021-03-24/full_ifrs/full_ifrs-cor_2021-03-24.xsd#ifrs-full_CashFlowsFromUsedInOperations" xlink:label="loc_ifrs-full_CashFlowsFromUsedInOperations" />
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/totalLabel" xlink:label="lab_ifrs-full_CashFlowsFromUsedInOperations" xml:lang="en">Net cash flows from (used in) operations</label>
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    <loc xlink:type="locator" xlink:href="http://xbrl.ifrs.org/taxonomy/2021-03-24/full_ifrs/full_ifrs-cor_2021-03-24.xsd#ifrs-full_InterestPaidClassifiedAsOperatingActivities" xlink:label="loc_ifrs-full_InterestPaidClassifiedAsOperatingActivities" />
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2009/role/negatedLabel" xlink:label="lab_ifrs-full_InterestPaidClassifiedAsOperatingActivities" xml:lang="en">Interest paid, classified as operating activities</label>
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    <loc xlink:type="locator" xlink:href="http://xbrl.ifrs.org/taxonomy/2021-03-24/full_ifrs/full_ifrs-cor_2021-03-24.xsd#ifrs-full_IncomeTaxesPaidClassifiedAsOperatingActivities" xlink:label="loc_ifrs-full_IncomeTaxesPaidClassifiedAsOperatingActivities" />
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    <loc xlink:type="locator" xlink:href="http://xbrl.ifrs.org/taxonomy/2021-03-24/full_ifrs/full_ifrs-cor_2021-03-24.xsd#ifrs-full_CashFlowsFromUsedInOperatingActivities" xlink:label="loc_ifrs-full_CashFlowsFromUsedInOperatingActivities" />
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    <loc xlink:type="locator" xlink:href="213800LS272L4FIDOH92-2022-12-31.xsd#ctec_AcquisitionOfPropertyPlantAndEquipmentAndIntangibleAssets" xlink:label="loc_ctec_AcquisitionOfPropertyPlantAndEquipmentAndIntangibleAssets" />
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_ctec_AcquisitionOfPropertyPlantAndEquipmentAndIntangibleAssets" xml:lang="en">Acquisition Of Property Plant And Equipment And Intangible Assets</label>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2009/role/negatedLabel" xlink:label="lab_ctec_AcquisitionOfPropertyPlantAndEquipmentAndIntangibleAssets" xml:lang="en">Acquisition Of Property Plant And Equipment And Intangible Assets</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ctec_AcquisitionOfPropertyPlantAndEquipmentAndIntangibleAssets" xlink:to="lab_ctec_AcquisitionOfPropertyPlantAndEquipmentAndIntangibleAssets" />
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="lab_ctec_AcquisitionOfPropertyPlantAndEquipmentAndIntangibleAssets" xml:lang="en">Acquisition of property, plant and equipment and intangible assets.</label>
    <loc xlink:type="locator" xlink:href="http://xbrl.ifrs.org/taxonomy/2021-03-24/full_ifrs/full_ifrs-cor_2021-03-24.xsd#ifrs-full_CashFlowsUsedInObtainingControlOfSubsidiariesOrOtherBusinessesClassifiedAsInvestingActivities" xlink:label="loc_ifrs-full_CashFlowsUsedInObtainingControlOfSubsidiariesOrOtherBusinessesClassifiedAsInvestingActivities" />
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2009/role/negatedLabel" xlink:label="lab_ifrs-full_CashFlowsUsedInObtainingControlOfSubsidiariesOrOtherBusinessesClassifiedAsInvestingActivities" xml:lang="en">Cash flows used in obtaining control of subsidiaries or other businesses, classified as investing activities</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ifrs-full_CashFlowsUsedInObtainingControlOfSubsidiariesOrOtherBusinessesClassifiedAsInvestingActivities" xlink:to="lab_ifrs-full_CashFlowsUsedInObtainingControlOfSubsidiariesOrOtherBusinessesClassifiedAsInvestingActivities" />
    <loc xlink:type="locator" xlink:href="213800LS272L4FIDOH92-2022-12-31.xsd#ctec_ProceedsFromDivestiture" xlink:label="loc_ctec_ProceedsFromDivestiture" />
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_ctec_ProceedsFromDivestiture" xml:lang="en">Proceeds From Divestiture</label>
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    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="lab_ctec_ProceedsFromDivestiture" xml:lang="en">Proceeds from divestiture.</label>
    <loc xlink:type="locator" xlink:href="213800LS272L4FIDOH92-2022-12-31.xsd#ctec_PaymentOfContingentConsiderationArisingFromAcquisitions" xlink:label="loc_ctec_PaymentOfContingentConsiderationArisingFromAcquisitions" />
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_ctec_PaymentOfContingentConsiderationArisingFromAcquisitions" xml:lang="en">Payment Of Contingent Consideration Arising From Acquisitions</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ctec_PaymentOfContingentConsiderationArisingFromAcquisitions" xlink:to="lab_ctec_PaymentOfContingentConsiderationArisingFromAcquisitions" />
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="lab_ctec_PaymentOfContingentConsiderationArisingFromAcquisitions" xml:lang="en">Purchase of financial instruments, classified as investing activities.</label>
    <loc xlink:type="locator" xlink:href="http://xbrl.ifrs.org/taxonomy/2021-03-24/full_ifrs/full_ifrs-cor_2021-03-24.xsd#ifrs-full_CashFlowsFromUsedInInvestingActivities" xlink:label="loc_ifrs-full_CashFlowsFromUsedInInvestingActivities" />
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/totalLabel" xlink:label="lab_ifrs-full_CashFlowsFromUsedInInvestingActivities" xml:lang="en">Net cash flows from (used in) investing activities</label>
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    <loc xlink:type="locator" xlink:href="http://xbrl.ifrs.org/taxonomy/2021-03-24/full_ifrs/full_ifrs-cor_2021-03-24.xsd#ifrs-full_PurchaseOfFinancialInstrumentsClassifiedAsInvestingActivities" xlink:label="loc_ifrs-full_PurchaseOfFinancialInstrumentsClassifiedAsInvestingActivities" />
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2009/role/negatedLabel" xlink:label="lab_ifrs-full_PurchaseOfFinancialInstrumentsClassifiedAsInvestingActivities" xml:lang="en">Purchase of financial instruments, classified as investing activities</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ifrs-full_PurchaseOfFinancialInstrumentsClassifiedAsInvestingActivities" xlink:to="lab_ifrs-full_PurchaseOfFinancialInstrumentsClassifiedAsInvestingActivities" />
    <loc xlink:type="locator" xlink:href="http://xbrl.ifrs.org/taxonomy/2021-03-24/full_ifrs/full_ifrs-cor_2021-03-24.xsd#ifrs-full_IncreaseDecreaseInCashAndCashEquivalentsBeforeEffectOfExchangeRateChanges" xlink:label="loc_ifrs-full_IncreaseDecreaseInCashAndCashEquivalentsBeforeEffectOfExchangeRateChanges" />
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/totalLabel" xlink:label="lab_ifrs-full_IncreaseDecreaseInCashAndCashEquivalentsBeforeEffectOfExchangeRateChanges" xml:lang="en">Net increase (decrease) in cash and cash equivalents before effect of exchange rate changes</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ifrs-full_IncreaseDecreaseInCashAndCashEquivalentsBeforeEffectOfExchangeRateChanges" xlink:to="lab_ifrs-full_IncreaseDecreaseInCashAndCashEquivalentsBeforeEffectOfExchangeRateChanges" />
    <loc xlink:type="locator" xlink:href="http://xbrl.ifrs.org/taxonomy/2021-03-24/full_ifrs/full_ifrs-cor_2021-03-24.xsd#ifrs-full_CashFlowsFromUsedInFinancingActivities" xlink:label="loc_ifrs-full_CashFlowsFromUsedInFinancingActivities" />
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/totalLabel" xlink:label="lab_ifrs-full_CashFlowsFromUsedInFinancingActivities" xml:lang="en">Net cash flows from (used in) financing activities</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ifrs-full_CashFlowsFromUsedInFinancingActivities" xlink:to="lab_ifrs-full_CashFlowsFromUsedInFinancingActivities" />
    <loc xlink:type="locator" xlink:href="http://xbrl.ifrs.org/taxonomy/2021-03-24/full_ifrs/full_ifrs-cor_2021-03-24.xsd#ifrs-full_DividendsPaidClassifiedAsFinancingActivities" xlink:label="loc_ifrs-full_DividendsPaidClassifiedAsFinancingActivities" />
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2009/role/negatedLabel" xlink:label="lab_ifrs-full_DividendsPaidClassifiedAsFinancingActivities" xml:lang="en">Dividends paid, classified as financing activities</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ifrs-full_DividendsPaidClassifiedAsFinancingActivities" xlink:to="lab_ifrs-full_DividendsPaidClassifiedAsFinancingActivities" />
    <loc xlink:type="locator" xlink:href="http://xbrl.ifrs.org/taxonomy/2021-03-24/full_ifrs/full_ifrs-cor_2021-03-24.xsd#ifrs-full_RepaymentsOfBorrowingsClassifiedAsFinancingActivities" xlink:label="loc_ifrs-full_RepaymentsOfBorrowingsClassifiedAsFinancingActivities" />
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2009/role/negatedLabel" xlink:label="lab_ifrs-full_RepaymentsOfBorrowingsClassifiedAsFinancingActivities" xml:lang="en">Repayments of borrowings, classified as financing activities</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ifrs-full_RepaymentsOfBorrowingsClassifiedAsFinancingActivities" xlink:to="lab_ifrs-full_RepaymentsOfBorrowingsClassifiedAsFinancingActivities" />
    <loc xlink:type="locator" xlink:href="http://xbrl.ifrs.org/taxonomy/2021-03-24/full_ifrs/full_ifrs-cor_2021-03-24.xsd#ifrs-full_PaymentsOfLeaseLiabilitiesClassifiedAsFinancingActivities" xlink:label="loc_ifrs-full_PaymentsOfLeaseLiabilitiesClassifiedAsFinancingActivities" />
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2009/role/negatedLabel" xlink:label="lab_ifrs-full_PaymentsOfLeaseLiabilitiesClassifiedAsFinancingActivities" xml:lang="en">Payments of lease liabilities, classified as financing activities</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ifrs-full_PaymentsOfLeaseLiabilitiesClassifiedAsFinancingActivities" xlink:to="lab_ifrs-full_PaymentsOfLeaseLiabilitiesClassifiedAsFinancingActivities" />
    <loc xlink:type="locator" xlink:href="213800LS272L4FIDOH92-2022-12-31.xsd#ctec_DescriptionOfAccountingPolicyForBasisOfAccountingAndPresentationPolicyTextBlock" xlink:label="loc_ctec_DescriptionOfAccountingPolicyForBasisOfAccountingAndPresentationPolicyTextBlock" />
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_ctec_DescriptionOfAccountingPolicyForBasisOfAccountingAndPresentationPolicyTextBlock" xml:lang="en">Description Of Accounting Policy For Basis Of Accounting And Presentation [Policy Text Block]</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ctec_DescriptionOfAccountingPolicyForBasisOfAccountingAndPresentationPolicyTextBlock" xlink:to="lab_ctec_DescriptionOfAccountingPolicyForBasisOfAccountingAndPresentationPolicyTextBlock" />
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="lab_ctec_DescriptionOfAccountingPolicyForBasisOfAccountingAndPresentationPolicyTextBlock" xml:lang="en">DescriptionOfAccountingPolicyForBasisOfAccountingAndPresentation.</label>
    <loc xlink:type="locator" xlink:href="213800LS272L4FIDOH92-2022-12-31.xsd#ctec_DisclosureOfRevenueAndSegmentalInformationTextBlock" xlink:label="loc_ctec_DisclosureOfRevenueAndSegmentalInformationTextBlock" />
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_ctec_DisclosureOfRevenueAndSegmentalInformationTextBlock" xml:lang="en">Disclosure Of Revenue And Segmental Information [Text Block]</label>
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    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="lab_ctec_DisclosureOfRevenueAndSegmentalInformationTextBlock" xml:lang="en">DisclosureOfRevenueAndSegmentalInformation.</label>
    <loc xlink:type="locator" xlink:href="213800LS272L4FIDOH92-2022-12-31.xsd#ctec_DescriptionOfAccountingPolicyForRevenueAndSegmentalInformationPolicyTextBlock" xlink:label="loc_ctec_DescriptionOfAccountingPolicyForRevenueAndSegmentalInformationPolicyTextBlock" />
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_ctec_DescriptionOfAccountingPolicyForRevenueAndSegmentalInformationPolicyTextBlock" xml:lang="en">Description Of Accounting Policy For Revenue And Segmental Information [Policy Text Block]</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ctec_DescriptionOfAccountingPolicyForRevenueAndSegmentalInformationPolicyTextBlock" xlink:to="lab_ctec_DescriptionOfAccountingPolicyForRevenueAndSegmentalInformationPolicyTextBlock" />
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="lab_ctec_DescriptionOfAccountingPolicyForRevenueAndSegmentalInformationPolicyTextBlock" xml:lang="en">DescriptionOfAccountingPolicyForRevenueAndSegmentalInformation.</label>
    <loc xlink:type="locator" xlink:href="213800LS272L4FIDOH92-2022-12-31.xsd#ctec_DisclosureOfNonOperatingExpenseIncomeNetTextBlock" xlink:label="loc_ctec_DisclosureOfNonOperatingExpenseIncomeNetTextBlock" />
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_ctec_DisclosureOfNonOperatingExpenseIncomeNetTextBlock" xml:lang="en">Disclosure Of Non Operating Expense Income Net [Text Block]</label>
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    <loc xlink:type="locator" xlink:href="213800LS272L4FIDOH92-2022-12-31.xsd#ctec_DescriptionOfAccountingPolicyForDivestituresPolicyTextBlock" xlink:label="loc_ctec_DescriptionOfAccountingPolicyForDivestituresPolicyTextBlock" />
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_ctec_DescriptionOfAccountingPolicyForDivestituresPolicyTextBlock" xml:lang="en">Description Of Accounting Policy For Divestitures [Policy Text Block]</label>
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    <loc xlink:type="locator" xlink:href="213800LS272L4FIDOH92-2022-12-31.xsd#ctec_DisclosureOfCapitalStructureAndNetDebtTextBlock" xlink:label="loc_ctec_DisclosureOfCapitalStructureAndNetDebtTextBlock" />
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_ctec_DisclosureOfCapitalStructureAndNetDebtTextBlock" xml:lang="en">Disclosure Of Capital Structure And Net Debt [Text Block]</label>
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    <loc xlink:type="locator" xlink:href="213800LS272L4FIDOH92-2022-12-31.xsd#ctec_DescriptionOfAccountingPolicyForAcquisitionsPolicyTextBlock" xlink:label="loc_ctec_DescriptionOfAccountingPolicyForAcquisitionsPolicyTextBlock" />
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_ctec_DescriptionOfAccountingPolicyForAcquisitionsPolicyTextBlock" xml:lang="en">Description Of Accounting Policy For Acquisitions [Policy Text Block]</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ctec_DescriptionOfAccountingPolicyForAcquisitionsPolicyTextBlock" xlink:to="lab_ctec_DescriptionOfAccountingPolicyForAcquisitionsPolicyTextBlock" />
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="lab_ctec_DescriptionOfAccountingPolicyForAcquisitionsPolicyTextBlock" xml:lang="en">DescriptionOfAccountingPolicyForAcquisitions.</label>
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    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="lab_ctec_DisclosureOfDivestituresExplanatoryTextBlock" xml:lang="en">Disclosure of divestitures explanatory [Text Block].</label>
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