Koyo International Limited, an investment holding company, provides integrated mechanical and electrical engineering services in Singapore. The company operates through Mechanical Engineering, Electrical Engineering, and Facilities Management divisions. It designs and installs air-conditioning and mechanical ventilation, plumbing and sanitary installation, and fire prevention and protection systems, as well as integrated monitoring and control systems; and high and low tension electrical distribution, communications, audio-visual, and securities systems. The company also provides maintenance, repair, and replacement services for commercial buildings, hotels, schools, and universities; supplies construction materials, including reclamation sand, construction sand, armour rock, granite, and other aggregates; owns mines and concession for raw materials, and chartering services; offers logistics planning and ancillary support services, such as stevedoring and dredging; designs, integrates, and implements industrial engineering services; and provides oil, gas, and marine engineering services, as well as facilities management services. In addition, it provides large scale solar heat collector arrays, hot water storage tanks, high-temperature heat pumps, phase change materials, non-chemical water treatment, electrical licensing services, regenerator, conditioner, degassing system, condensate water collection system, and liquid desiccant systems. Further, the company engages in the property development and construction, management, and investment activities; and general trading of products. It serves customers in construction, marine, oil and gas, industrial, and pharmaceutical industries, as well as public sector. The company was founded in 1983 and is headquartered in Singapore.