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Property plant and equipment net (Details 1) ¥ in Thousands, $ in Thousands | 12 Months Ended
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Dec. 31, 2024 USD ($) | Dec. 31, 2024 CNY (¥) | Dec. 31, 2023 USD ($) | Dec. 31, 2023 CNY (¥) | Dec. 31, 2022 USD ($) | Dec. 31, 2022 CNY (¥)
Depreciation charge | $ | $ 14 |  | $ 15 |  | $ 33 |
ZHEJIANG TIANLAN |  |  |  |  |  |
Depreciation charge | ¥ |  | ¥ 6,175 |  | ¥ 5,964 |  | ¥ 6,580

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