* March 2003: Established Mejiro Genossen Co., Ltd. Started the light source business, mainly UV lighting equipment
* October 2004: Released metal halide lighting equipment
* July 2007: Established Etendue Mejiro Co., Ltd. as a subsidiary. Started a lens business
* September 2013: Merged Etendue Mejiro Co., Ltd.
* February 2015: Transferred the light source business to Cerma Precision Co., Ltd.
* June 2016: Mejiro Genossen Co., Ltd. split into Mejiro 67 Co., Ltd. and Mejiro Genossen Co., Ltd.
* July 2016: Mejiro Genossen Co., Ltd. Merged by Young Optics Inc.
* July 2017:Acquired Akita factory (former Iwata Optical Co., Ltd.)
* October 2018:MG Head office Tokyo Toshima-ku move to Itabashi-ku