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6. Accounts receivable, net (Details 1) ¥ in Thousands, $ in Thousands | Dec. 31, 2016 CNY (¥) | Dec. 31, 2016 USD ($) | Dec. 31, 2015 CNY (¥) | Dec. 31, 2015 USD ($)
--- | --- | --- | --- | ---
Accounts receivable | $ |  | $ 4,393 |  | $ 4,500
ZHEJIANG TIANLAN |  |  |  |
Accounts receivable | ¥ 165,100 |  | ¥ 207,907 |
Current |  |  |  |
Accounts receivable | $ |  | 1,789 |  | 2,762
30 - 59 days past due |  |  |  |
Accounts receivable | $ |  | 1,072 |  | 633
60 - 89 days past due |  |  |  |
Accounts receivable | $ |  | 852 |  | 635
Greater than 90 days past due |  |  |  |
Accounts receivable | $ |  | $ 680 |  | $ 470
Within 1 year | ZHEJIANG TIANLAN |  |  |  |
Accounts receivable | 118,476 |  | 150,345 |
1 year – 2 years | ZHEJIANG TIANLAN |  |  |  |
Accounts receivable | 31,340 |  | 44,393 |
2 years – 3 years | ZHEJIANG TIANLAN |  |  |  |
Accounts receivable | 9,387 |  | 8,588 |
3 years – 4 years | ZHEJIANG TIANLAN |  |  |  |
Accounts receivable | 4,593 |  | 3,881 |
4 years – 5 years | ZHEJIANG TIANLAN |  |  |  |
Accounts receivable | 240 |  | 700 |
Greater than 5 years | ZHEJIANG TIANLAN |  |  |  |
Accounts receivable | ¥ 1,064 |  | ¥ 0 |

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