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v3.23.2

Summary of significant accounting policies (Tables) | 12 Months Ended
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Dec. 31, 2022
Summary of significant accounting policies |
Schedule of estimated useful life of property and equipment | ​
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Category |  | Estimated useful life
Machinery and electronic equipment |  | 3 – 10 years
Transportation vehicles |  | 4 years
Office and other equipment |  | 5 years
Leasehold improvement |  | Shorter of the lease term and the estimated useful lives of the assets

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