July 1985

Yuruson Co.,Ltd. is established with a capital of 5 million yen in Takaya-cho, Higashihiroshima-shi, and starts the production of bolts.

June 1989

Patent rights acquired for locking nuts (Yuruson nuts).

February 1991

Head Office relocated to Hachihonmatsu-cho, Higashihiroshima-shi.
Plant relocated to Kouchi-cho, Kamo-gun, Hiroshima-ken, and production of weld nuts starts.

April 1991

Technical tie-up with Boltun Corporation (Taiwan).

February 1993

Rights acquired from Disc-Lock International (USA) for the sale of locking nuts (D-Lock nuts) in nine countries in Asia, including Japan.
Application submitted for utility model registration for locking bolts (Y-Lock bolts).

October 1993

D･L･Y, a distributor of D-Lock nuts, established in Japan (with 10 member companies).

April 1994

Exclusive agency agreement concluded with Keyang Electric Machinery Co., Ltd. (Korea) for D-Lock nuts in Korea.

June 1994

Exclusive agency agreement concluded with Harlin International Co., Ltd. (Taiwan) for D-Lock nuts in Taiwan.

September 1994

Technical tie-up with Taeyang Metal Ind. Co., Ltd. (Korea).

November 1994

Capital increased to 10 million yen, application submitted for utility model registration for new weld nut.

January 2001

Head Office and plant relocated to current location (Hachihonmatsu Iida, Higashihiroshima-shi).

September 2001

OKUMOTO Tetsushi appointed company president. Started new business, such as secondary processing.

November 2007

Trading started with Ni-Thai Engineering Co., Ltd. (Thailand)

October 2008

ISO9001 2000 certification acquired.

October 2009

ISO9001 2008 certification acquired.

October 2017

ISO9001 2015 certification acquired.