Water purifying apparatus; waste water treatment tanks [for industrial purposes]; waste water treatment tanks for household purposes; septic tanks [for industrial purposes]; septic tanks for household purposes; wastewater deodorizing treatment apparatus; sludge treatment apparatus; drying apparatus [for chemical processing]; recuperators [for chemical processing]; steamers [for chemical processing]; evaporators [for chemical processing]; distillers [for chemical processing]; heat exchangers [for chemical processing]; dish disinfectant apparatus for industrial purposes; bath fittings; household tap-water filters; tap water faucets; level controlling valves for tanks; pipe line cocks; ball valves for water supply; mixing valves of metal for water pipes; valves for gas-fired water heaters; hydrants; water stop valves; apparatus for water supply; float valves for agriculturalirrigation for adjusting water quantity; wastewater treatment apparatus for industrial purposes; industrial wastewater treatment apparatus; wastewater treatment apparatus

Non-metallic minerals for building or construction; ceramic building materials; bricks and refractory products; building materials made of linoleum for fixing to existing walls or floors; plastic building materials; synthetic building materials; soundproofing and insulation materials of foamed plastic for building and construction; asphalt, and asphalt building or construction materials; rubber building or construction materials; plaster [for building purposes]; lime building or construction materials; building or construction materials of plaster; rockslide retention nets of textile [construction materials]; cement and its products; building timber; building stone; building glass; joinery fittings [not of metal]; nonmetallic mineral materials [unworked or partly worked]; tar and pitch; water-pipe valves [not of metal or plastics]; building materials, not of metal

Plumbing; construction; machinery installation; repair or maintenance of chemical processing machines and apparatus; repair or maintenance of measuring and testing machines and instruments; repair or maintenance of reservoirs; repair or maintenance of water purifying apparatus; repair or maintenance of chemical plants; spraying work of urethane foam; construction consultancy; operation and maintenance of building equipment; repair or maintenance of painting machines and apparatus; cleaning of building exterior surfaces; window cleaning; carpet and rug cleaning; floor polishing; repair, maintenance or servicing of pipe members and tanks; excavation services of geothermal well; waterwork construction work; installation of water pipelines; maintenance or cleaning and washing of waterworks facility

Designing of machines, apparatus, instruments [including their parts] or systems composed of such machines, apparatus and instruments; testing, inspection or research of pharmaceuticals, cosmetics or foodstuffs; testing, inspection or research on agriculture, livestock breeding or fisheries; testing or research on machines, apparatus and instruments; deterioration investigation and diagnosis of pipe members and tanks; consulting service relating to geological survey; consulting service relating to the design of water and sewerage and septic tanks; design of water and sewerage; architectural services for the design of water treatment facility; planning and design of water supply facility and sewage facility and industrial water facility; planning of facility construction of water and sewerage treatment and plumbing and installation work of machines, apparatus and instruments for water treatment facility; research, analysis, diagnosis, testing, inspection or study relating to geothermal generation and power generation and providing information relating thereto; research, analysis, diagnosis, testing, inspection or study relating to ground heat (renewable energy) and providing information relating thereto