Oshima Prototype Engineering Co

Since 1951, the prototypes started from waveguides under the guidance of Nippon Telegraph and Telephone Public Corporation's Telecommunications Research Laboratory, the Ministry of International Trade and Industry's Institute of Electronics Technology Research Institute, and research laboratories at each university. With the development, it has spread to optical communication and laser related fields, and the work accuracy has been improved from a hundredth of a unit to a micron, and it has been processed in a temperature-controlled room.