Tamagawa Holdings Co., Ltd. engages in the electronic and communication equipment business. It offers high-frequency electronic components, including attenuators, splitters, couplers, switches, and filters; and optical-related and electronic application equipment, such as optical transmission equipment, frequency converters, amplifiers, frequency synthesizers, digital signal processing equipment, video monitoring systems, and various testing equipment, as well as develops, manufactures, and sells millimeter-wave products. The company is also involved in the sale of power plants for sale; sale of electricity generated by small wind farms and other renewable energy power plants; and sale of owner power plants. The company was founded in 1968 and is headquartered in Tokyo, Japan.