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v3.19.3

Summary of significant accounting policies (Tables) | 12 Months Ended
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Dec. 31, 2019
Summary of significant accounting policies |
Schedule of estimated useful lives of property, plant and equipment | The estimated useful lives are as follows:
|  | Useful Life
Building |  | 10‑20 years
Electronic devices |  | 5‑10 years
Automobile |  | 5‑10 years
Office equipment |  | 5 years
Leasehold improvements |  | Shorter of the lease term or useful life

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- References No definition available. + Details
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