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v3.21.1

Summary of the main accounting policies: Land, furniture and equipment (Details) | 12 Months Ended
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Dec. 31, 2020 | Dec. 31, 2019
Furniture equipment | Minimum |  |
Land, furniture and equipment: |  |
Useful life measured as period of time, property, plant and equipment | 10 years | 10 years
Furniture equipment | Maximum |  |
Land, furniture and equipment: |  |
Useful life measured as period of time, property, plant and equipment | 20 years | 20 years
Machinery | Minimum |  |
Land, furniture and equipment: |  |
Useful life measured as period of time, property, plant and equipment | 10 years | 10 years
Machinery | Maximum |  |
Land, furniture and equipment: |  |
Useful life measured as period of time, property, plant and equipment | 20 years | 20 years
Computer equipment | Minimum |  |
Land, furniture and equipment: |  |
Useful life measured as period of time, property, plant and equipment | 20 years | 20 years
Computer equipment | Maximum |  |
Land, furniture and equipment: |  |
Useful life measured as period of time, property, plant and equipment | 33 years | 33 years
Transportation equipment | Minimum |  |
Land, furniture and equipment: |  |
Useful life measured as period of time, property, plant and equipment | 20 years | 20 years
Transportation equipment | Maximum |  |
Land, furniture and equipment: |  |
Useful life measured as period of time, property, plant and equipment | 25 years | 25 years
Improvements to leased premises |  |
Land, furniture and equipment: |  |
Useful life measured as period of time, property, plant and equipment | 10 years | 10 years

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- Definition The useful life, measured as period of time, used for property, plant and equipment. [Refer: Property, plant and equipment] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 16 -IssueDate 2020-01-01 -Paragraph 73 -Subparagraph c -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=16&code=ifrs-tx-2020-en-r&anchor=para_73_c&doctype=Standard -URIDate 2020-01-01 + Details
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