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Commitments and contingencies (Details Narrative) ¥ in Thousands, $ in Thousands | 12 Months Ended |  |
--- | --- | --- | ---
Dec. 31, 2020 CNY (¥) | Dec. 31, 2019 CNY (¥) | Dec. 31, 2018 CNY (¥) | Dec. 31, 2020 USD ($) | Dec. 31, 2019 USD ($)
Banking facilities available for overdraft and import and export credits | $ |  |  |  | $ 897 | $ 897
Weighted average interest rate |  |  |  | 4.90% | 4.90%
ZHEJIANG TIANLAN |  |  |  |  |
Operating leases expense | ¥ | ¥ 0 | ¥ 0 | ¥ 0 |  |

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