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Contract assets (Details) - ZHEJIANG TIANLAN - CNY (¥) ¥ in Thousands | Dec. 31, 2018 | Dec. 31, 2017
--- | --- | ---
Contracts costs incurred plus estimated earnings | ¥ 236,044 | ¥ 330,322
Less: progress billings | (135,050) | (211,066)
Cost and estimated earnings in excess of billings | ¥ 100,994 | ¥ 119,256

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