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Contract assets and liabilities (Details) ¥ in Thousands, $ in Thousands | Dec. 31, 2024 USD ($) | Dec. 31, 2024 CNY (¥) | Dec. 31, 2023 USD ($) | Dec. 31, 2023 CNY (¥)
--- | --- | --- | --- | ---
Contract assets | $ | $ 135 |  | $ 66 |
ZHEJIANG TIANLAN |  |  |  |
Contract assets | ¥ |  | ¥ 66,644 |  | ¥ 72,880
Unbilled revenue |  |  |  |
Contract assets | $ | $ 135 |  | $ 66 |
Unbilled revenue | ZHEJIANG TIANLAN |  |  |  |
Contract assets | ¥ |  | ¥ 66,644 |  | ¥ 72,880

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- Definition Amount, after allowance for credit loss, of right to consideration in exchange for good or service transferred to customer when right is conditioned on something other than passage of time. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 606 -SubTopic 10 -Name Accounting Standards Codification -Section 45 -Paragraph 3 -Publisher FASB -URI https://asc.fasb.org/1943274/2147479837/606-10-45-3 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 606 -SubTopic 10 -Name Accounting Standards Codification -Section 45 -Paragraph 1 -Publisher FASB -URI https://asc.fasb.org/1943274/2147479837/606-10-45-1 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Topic 606 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 8 -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org/1943274/2147479806/606-10-50-8 + Details
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