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Contract assets and liabilities (Details 4)
¥ in Thousands, $ in Thousands
Dec. 31, 2022
USD ($)
Dec. 31, 2022
CNY (¥)
Dec. 31, 2021
USD ($)
Dec. 31, 2021
CNY (¥)
Unbilled revenue | $ $ 217   $ 74  
Deferred revenue | $ (625)   (1,076)  
Estimated earnings | $ (408)   (1,002)  
Contract assets, net | $ $ 217   $ 74  
ZHEJIANG TIANLAN        
Deferred revenue | ¥   ¥ (34,503)   ¥ (37,481)
Gross contract assets | ¥   89,440   81,198
Less: allowance for doubtful accounts | ¥   12,448   8,888
Contract assets, net | ¥   ¥ 76,992   ¥ 72,310