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6. Accounts receivable, net (Details) ¥ in Thousands, $ in Thousands | Dec. 31, 2014 CNY (¥) | Dec. 31, 2014 USD ($) | Dec. 31, 2013 CNY (¥) | Dec. 31, 2013 USD ($) | Dec. 31, 2012 CNY (¥)
--- | --- | --- | --- | --- | ---
Accounts receivable | $ |  | $ 4,316 |  | $ 4,151 |
Less: Allowance for doubtful debts | $ |  | (48) |  | (69) |
Net | $ |  | $ 4,268 |  | $ 4,082 |
ZHEJIANG TIANLAN |  |  |  |  |
Accounts receivable | ¥ 185,453 |  | ¥ 166,433 |  |
Less: Allowance for doubtful debts | (28,835) |  | (19,306) |  |
Net | 156,608 |  | 147,127 |  |
ZHEJIANG JIAHUAN |  |  |  |  |
Accounts receivable | 74,024 |  | 75,445 |  |
Less: Allowance for doubtful debts | (131) |  | (8,000) |  | ¥ (8,461)
Net | ¥ 73,893 |  | ¥ 67,445 |  |

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