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v3.22.1

Summary of significant accounting policies (Tables) | 12 Months Ended
--- | ---
Dec. 31, 2021
Summary of significant accounting policies |
Property, plant and equipment |
Office premises | 47 to 51 years
Leasehold improvements | over terms of the leases or the useful lives whichever is less
Furniture, fixtures and office equipment | 3 to 5 years
Motor vehicles | 4 years
Testing equipment | 3 years
Engineering segment backlog |
|  | 2021 |  |  | 2020 |
|  | US$’000 |  |  | US$’000 |
Engineering segment |  |  | 5,400 |  |  |  | 11,581 |

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