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Intangible assets net (Details 2) - ZHEJIANG TIANLAN
¥ in Thousands
Dec. 31, 2022
CNY (¥)
Dec. 31, 2022
USD ($)
Dec. 31, 2021
CNY (¥)
2023   $ 257,000  
2024   257,000  
2025   257,000  
2026   257  
2027   257  
Thereafter   523,000  
Intangible assets, net ¥ 1,808 $ 1,808,000 ¥ 1,865