Yamau Co., Ltd. engages in the manufacture and sale of civil engineering, landscape and concrete products. It operates through the following segments: Concrete Manufacturing and Sales; Watergate Manufacturing, Construction & Maintenance; Geological Survey, Consultant and Civil Engineering Work; Concrete Structure Survey and Inspection; and Information Equipment Sales and Maintenance, and Environment Product Sales. The Concrete Manufacturing and Sales segment produces and sells engineering, landscape, and resin concrete products. The Watergate Manufacturing, Construction & Maintenance segment handles the manufacture, construction and maintenance of of water pipe bridges, steel structures, floodgates, and dust removal machine. The Geological Survey, Consultant and Civil Engineering Work segment conducts geological survey, landscape control, surveying and design work. The Concrete Structure Survey and Inspection segment provides contract inspection, survey, repair, and reinforcement work for concrete structures such as bridges and tunnels. The Information Equipment Sales and Maintenance, and Environment Product Sales segment sells and maintains financial business processing support equipment, money handling machines, light emitting diode lamps, and peripheral equipment. The company was founded in October 1953 and is headquartered in Fukuoka, Japan.