Time	History of Yoshikawa Kogyo	History of Yoshikawa's group companies
May 1920	Started the business under the name of Yoshikawa-gumi (in the premises of Governmental Yawata Steel Works.)
Apr. 1950	Opened Hirohata Branch.
Nov. 1950	Opened Muroran Branch.
May 1951	Changed the organization to a partner corporation, Yoshikawa Kogyosho.
Jun. 1953	Opened Hikari Branch
Feb. 1958	Changed the organization to Yoshikawa Kogyo Co., Ltd.
Jan. 1964	Opened Sakai Branch.
Jun. 1964	Opened Nagoya Branch.
Nov. 1966	Opened Kimitsu Branch.
Feb. 1970	Opened Oita Branch.
Aug. 1975	Opened Tokyo Affiliate.
Jun. 1976	Opened Yahata Branch.
Jun. 1978	Opened Wakamatsu Steel Structure Business Office (present Nittetsu Bridge Co., Ltd.).
May 1979	Opened a work office for Osaka Gas Co., Ltd.
Apr. 1982	Opened Thermal Spray Business Office (present Surface Treatment Business Office).
Nov. 1983		Yoshikawa Kikai Kogyo Co., Ltd. was founded.
Jul. 1984		Yoshikawa Semiconductor Co., Ltd. was founded.
Mar. 1985		Yoshikawa Sekkei Kogyo Co., Ltd. was founded.
Dec. 1986	Opened Roll Business Office (present Nittetsu Hyper Metal Co., Ltd.)
Nov. 1987		Yoshikawa Systec Co., Ltd. was founded.
Apr. 1988	Opened Yoshikawa High Precision Center.
Dec. 1996		Yoshikawa Seimitsu Co., Ltd. was founded.
Aug. 1997		PT Yoshikawa Electronics Bintan was founded.
Feb. 1999		West-Japan Auto Recycle was founded.
Mar. 1999		Yoshikawa RF Systems Co., Ltd. was founded.
Apr. 1999		Yoshikawa Electronics Engineering Co., Ltd. was founded.
Nov. 2000	Constructed a pre-molded package plant in Kitakyushu Factory of Yoshikawa High Precision Co., Ltd.
Apr. 2002		Yoshikawa High Precision Shenzhen Co., Ltd. was founded.
Apr. 2004		East-Japan Recycle was founded.
Jan. 2007	Yoshikawa kogyo RF solution center was founded.