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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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