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Inventories, net (Details) ¥ in Thousands, $ in Thousands	Dec. 31, 2017 USD ($)	Dec. 31, 2017 CNY (¥)	Dec. 31, 2016 USD ($)	Dec. 31, 2016 CNY (¥)	Dec. 31, 2015 USD ($)
Raw materials | $	$ 132		$ 115
Work in progress | $	48		29
Finished goods | $	748		554
Inventory, gross | $	928		698
Provision for obsolete and slow moving inventories | $	(432)		(354)		$ (318)
Inventory, net | $	$ 496		$ 344
ZHEJIANG TIANLAN
Raw materials		¥ 4,741		¥ 5,606
Work in progress		6,452		7,269
Finished goods		3,924		230
Inventory, net		15,117		13,105
ZHEJIANG JIAHUAN
Raw materials		1,764		6,529
Work in progress		11,316		11,264
Finished goods		1,977		10,212
Inventory, net		¥ 15,057		¥ 28,005

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Amount of inventory reserves for last-in first-out (LIFO) and other inventory valuation methods.

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Carrying amount, net of valuation reserves and adjustments, as of the balance sheet date of merchandise or goods held by the company that are readily available for sale.

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Gross amount, as of the balance sheet date, of merchandise, goods, commodities, or supplies held for future sale or to be used in manufacturing, servicing or production process.

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Amount after valuation and LIFO reserves of inventory expected to be sold, or consumed within one year or operating cycle, if longer.

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Carrying amount, net of valuation reserves and adjustments, as of the balance sheet date of unprocessed items to be consumed in the manufacturing or production process.

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Carrying amount, net of reserves and adjustments, as of the balance sheet date of merchandise or goods which are partially completed. This inventory is generally comprised of raw materials, labor and factory overhead costs, which require further materials, labor and overhead to be converted into finished goods, and which generally require the use of estimates to determine percentage complete and pricing.

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