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Land use right, net (Details 1) - CNY (¥)
¥ in Thousands
Dec. 31, 2017
Dec. 31, 2016
ZHEJIANG TIANLAN    
2018 ¥ 149  
2019 149  
2020 149  
2021 149  
2022 149  
Thereafter 4,853  
Total 5,598 ¥ 5,747
ZHEJIANG JIAHUAN    
2018 163  
2019 163  
2020 163  
2021 163  
2022 163  
Thereafter 5,310  
Total ¥ 6,125 ¥ 6,288