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Building insulation; building sealing; varnishing; general demolition; demolition of buildings; plastering; plumbing; road paving; tunnelling work; dredging of waterway, rivers and lakes and marshes; water supply and drain facility work; soil conditioning work; mining extraction; substituting of lubricant; vehicle greasing; vehicle lubrication; motor vehicle maintenance and repair; anti-trust treatment for vehicles; pump repair; retreading of tires; repair and maintenance of industrial boilers; repair and maintenance of motor vehicles; repair and maintenance of solid parking facility; repair and maintenance of air compressor; repair and maintenance of metal workings machines and tools; repair and maintenance of cranes; repair and maintenance of optical apparatus and instruments; repair and maintenance of mining machines and tools; repair and maintenance of construction equipments; repair and maintenance of electronic computers; repair and maintenance of electronic diagnostic apparatus; repair and maintenance of airplane; repair and maintenance of ejection molding machines; repair and maintenance of hydraulic machinery and tools; repair and maintenance of measuring machines and tools; repair and maintenance of air conditioning apparatus; repair and maintenance of electric and magnetic measuring instruments; repair and maintenance of cargo handling machines and apparatus; repair and maintenance of electronical distribution or control machines and apparatus; repair and maintenance of belt conveyors; repair and maintenance of engines and motors; repair and maintenance of snowplow; installation of air conditioning apparatus; installation, maintenance and repair of various industrial machinery; installation, maintenance and repair of office machines and equipment; installation of water heaters by solar heat; installation, repair or maintenance of apparatus, machines and plants in pulpe and paper making industrial field; providing information of repair and maintenance of automobile; providing information of repair and maintenance of ships; providing information of construction; factory construction; harbour construction, pipeline construction and maintenance; warehouse construction and repair; pier breakwater building; diagnosis of oils by means of collecting sample oils from various machines and vehicles so as to diagnose the degree of metal abrasion density; supervising building construction; supervision of running waste disposal facilities; cleaning; maintenance and supervision of sewage disposal tanks; cleaning of buildings (exterior surface); cleaning of buildings (interior); window cleaning; rental of construction equipment; rental of bulldozers, powershovels and of excavators