Oi Electric. 

Oi Electric Co., Ltd. supplies information and communication technology and associated services crucial for Japan's social infrastructure. Its product range includes advanced transmission and monitoring solutions, comprising optical transport network platforms, media converter equipment, and devices for relaying contact information. Furthermore, Oi Electric produces a comprehensive array of electronic measurement instruments. This extensive catalog features multifunctional level variation recorders, line noise measuring devices, analog level meters, ISDN line analyzers and testers, broadband selective level meters, frequency selective level meters, receiving sensitivity analyzers, bit error rate testers, and tools for assessing transmission characteristics. The portfolio also extends to variable resistor attenuators, circuit inspection testers, tone channel selective level meters, security and surveillance systems, remote sensing technology, and diverse wireless application systems. Beyond hardware, the company develops and markets specialized software for its equipment. It also undertakes the construction and maintenance of communication infrastructure, such as optical networks and CATV systems. Demonstrating business diversification, Oi Electric also engages in restaurant operations, building management, and temporary employment services. Established in 1950, Oi Electric Co., Ltd. is headquartered in Yokohama, Japan.