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Prepayments and other current assets (Details)
¥ in Thousands, $ in Thousands
Dec. 31, 2018
USD ($)
Dec. 31, 2018
CNY (¥)
Dec. 31, 2017
USD ($)
Dec. 31, 2017
CNY (¥)
Deposits paid $ 259   $ 85  
Prepayments 59   475  
Other receivables 156   104  
Other tax recoverable 73   2  
Prepayments and other current assets $ 547   $ 666  
ZHEJIANG TIANLAN        
Prepayments | ¥   ¥ 18,702   ¥ 19,606
Other receivables | ¥   8,791   10,775
Other current assets | ¥   1,485   0
Prepayments and other current assets | ¥   ¥ 28,978   ¥ 30,381