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- General construction (including alteration, addition, repair and maintenance) of residential buildings, carried ?out on own-account basis or on a fee or contract basis. (54)
- Construction and maintenance of roads, rail-beds, bridges, tunnels, pipelines, rope-ways, ports, harbours and runways etc. (11)
- 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. (8)
- Construction n.e.c. including special trade construction [includes construction and maintenance of sports stadia and other construction not elsewhere classified and special trade construction such as foundation work, water well drilling scaffolding etc. carried out on a fee or contract basis.] (4)
- Construction and maintenance of hydro-electric projects (1)