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Prepayments and other current assets (Details)
¥ in Thousands, $ in Thousands
Dec. 31, 2022
USD ($)
Dec. 31, 2022
CNY (¥)
Dec. 31, 2021
USD ($)
Dec. 31, 2021
CNY (¥)
Deposits paid $ 255   $ 243  
Prepayments 76   104  
Other receivables 152   222  
Other tax recoverable 3   3  
Prepayments and other current assets $ 486   $ 572  
ZHEJIANG TIANLAN        
Prepayments | ¥   ¥ 12,547   ¥ 22,717
Prepayments and other current assets | ¥   21,151   33,498
Deposits paid for bidding projects and temporary payments | ¥   6,004   7,030
Other current assets | ¥   ¥ 2,600   ¥ 3,751