http://www.ogura-racing.com/index.html

Ogura Clutch Co., Ltd. (Ogura Clutch Co., Ltd.) develops, manufactures and sells general industrial clutches such as car air conditioners and mechanical superchargers based in Kiryu City, Gunma Prefecture. Company. It also manufactures and sells reinforced clutches for racing, and is sometimes called ORC by car enthusiasts under the brand name (Ogura Racing Clutch).