37 building sealing and caulking services, computer installation and repair construction and repair of warehouse, construction management, construction of pier and harbour, construction services, namely, planning, laying out and custom construction of residential and commercial communities, automobile engine maintenance and repair, furniture upholstering, hydro-electric factory construction, installation and repair of elevators, installation and repair of amusement facilities, installation and repair of burglar and fire alarms, installation and repair of electric appliance, installation and repair of environmental pollution prevention equipment, installation and repair of telecommunication equipment, installation of building insulation, installation of water supply and drainage systems, maintenance and repair of business and office machinery and equipment, installation, maintenance and repair of heating and freezing apparatus, namely, water heaters electric heaters for commercial use, and freezers, photographic apparatus repair, pipeline installation and repair, plumbing services, rental of construction equipment ,road paving, ship maintenance and repair, underwater building construction, vehicle repair and maintenance, waste disposal for others