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Receivables, net (Details)
¥ in Thousands, $ in Thousands
Dec. 31, 2018
USD ($)
Dec. 31, 2018
CNY (¥)
Dec. 31, 2017
USD ($)
Dec. 31, 2017
CNY (¥)
Receivables | $ $ 5,201   $ 3,917  
Less: allowance for doubtful debts | $ (112)   (109)  
Net | $ $ 5,089   $ 3,808  
ZHEJIANG TIANLAN        
Receivables | ¥   ¥ 177,632   ¥ 222,279
Less: allowance for doubtful debts | ¥   (24,074)   (41,761)
Net | ¥   ¥ 153,585   ¥ 180,518