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Intangible assets net (Details) - ZHEJIANG TIANLAN ¥ in Thousands, $ in Thousands | Dec. 31, 2022 CNY (¥) | Dec. 31, 2022 USD ($) | Dec. 31, 2021 CNY (¥)
--- | --- | --- | ---
Patents | ¥ 3,950 |  | ¥ 3,750
Others | 165 |  | 165
Amortizable intangible assets | 4,115 |  | 3,915
Less: accumulated amortization | (2,307) |  | (2,050)
Net carrying amount of intangble assets | ¥ 1,808 | $ 1,808 | ¥ 1,865

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