Incorporated in 1969 as a private limited company in collaboration with International Rectifier Corporation, US, for the manufacture of power semiconductor devices, Ruttonsha International Rectifier (RIR) was converted into a public limited company in Mar.'86. The company made its maiden public offer in 1986. Initially situated at Vikhroli, Bombay, the company's unit was later on shifted to Halol, Gujarat. It manufactures power semiconductors - power rectifiers, silicon controlled rectifiers and power rectifier assemblies. RIR also manufactures electronic equipment like battery chargers, rectifiers, etc. The products are distributed directly to original equipment manufacturers (OEM), the Defence, Railway establishments and also through dealer network. RIR came out with a rights issue in Sep.'93 to part-finance the additional working capital requirements and to finance new machinery for the indigenisation of its products. The association with International Rectifier, the US collaborator, ended in 1995, and the complete technical know-how for the silicon controlled rectifier had been handed over to the company. The company received a technical know-how for Silicon Rectifiers and Silicon Controlled Rectifiers upto 30mm devices from M/s International Rectifier Corporation,California USA.