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Summary of significant accounting policies (Tables)

12 Months Ended

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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The tabular disclosure of useful life of property and equipment.

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