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Prepayments and other current assets (Details)
¥ in Thousands, $ in Thousands
Dec. 31, 2023
USD ($)
Dec. 31, 2023
CNY (¥)
Dec. 31, 2022
USD ($)
Dec. 31, 2022
CNY (¥)
Deposits paid $ 40   $ 255  
Prepayments 68   76  
Other receivables 134   152  
Other tax recoverable 4   3  
Prepayments and other current assets $ 246   $ 486  
ZHEJIANG TIANLAN        
Prepayments | ¥   ¥ 16,622   ¥ 12,547
Deposits paid for bidding projects and temporary payments | ¥   6,257   6,004
Other current assets | ¥   862   2,600
Prepayments and other current assets | ¥   ¥ 23,741   ¥ 21,151