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Land use right net (Details 1) - CNY (¥) | 12 Months Ended
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Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
ZHEJIANG TIANLAN |  |  |
Amortization expense | ¥ 180 | ¥ 150 | ¥ 150

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