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- Construction and maintenance of roads, rail-beds, bridges, tunnels, pipelines, rope-ways, ports, harbours and runways etc. (6)
- General construction (including alteration, addition, repair and maintenance) of residential buildings, carried ?out on own-account basis or on a fee or contract basis. (5)
- General construction (including alteration, addition, repair and maintenance) of non-residential buildings, carried ?out on own-account basis or on a fee or contract basis. (3)