August 1916

Founded as Kogyo Seisakujo at the same location as current headquarters of Osaki Electric Co., Ltd.

January 1937

Changed corporate status to a joint stock company.
Manufacture and sales items: distribution panels, switching panels, instrument transformers, automatic voltage adjustors, etc.

April 1941

Acquired Osaki Kogyo Co., Ltd. and changed business name to Osaki Electric Co., Ltd.

February 1948

Constructed Kamata Plant in Ota Ward, Tokyo.

February 1949

Started manufacturing watt-hour meters at Kamata Plant.

December 1954

Started manufacturing current limiters and molded-case circuit breakers.

January 1962

Listed on the Second Section of the Tokyo Stock Exchange.

September 1963

Constructed Saitama Plant in Iruma-gun, Saitama Prefecture.
Organized manufacturing share system among Saitama Plant, Kamata Plant and Gotanda Plant.

June 1968

Introduced technologies of maximum demand watt-hour meter, time-switch and ripple control from Landis & Gyr in Switzerland.

February 1974

Constructed Iwate Plant in Iwate-gun, Iwate Prefecture to manufacture earth leakage breakers.

November 1978

Acquired Hongo Seikei Kogyo in Iruma-gun, Saitama Prefecture (currently Osaki Platech Co., Ltd., consolidated subsidiary).

May 1980

Streamlined corporate structure in building up a transformer factory at Saitama Plant and integrated Gotanda Plant into Saitama Plant.

October 1980

Enlisted on First Listing of Tokyo Stock Exchange.

April 1987

Established Iwate R&D Center at Iwate Plant (currently Iwate Software Center.).

July 1987

Constructed built up a factory of electronic watt-hour meters at Saitama Plant.

October 1988

Constructed Chiba Plant in Chosei-gun, Chiba Prefecture. 
Transferred manufacturing function of Kamata Plant to Chiba Plant for streamlining and strengthening production capacity.

April 1990

Established Osaki Engineering Co., Ltd. (currently consolidated subsidiary) in Shinagawa Ward, Tokyo. (later moved to Iruma City Saitama)

December 1990

Constructed R&D Center and Logistics Center in the venue of ex-Kamata Plant.

October 1991

Established Osaki Estate Co., Ltd. (currently consolidated subsidiary).

April 1994

Started manufacturing optical couplers.

January 1995

Fulfilled manufacturing system of optical communication devices such as optical couplers.

March 1996

Obtained ISO-9002 certification at Saitama Plant.

April 1997

Established Osaki Tech-service Co., Ltd. in Shinagawa Ward, Tokyo (currently consolidated subsidiary).

February 1999

Received title of authorized manufacturer of watt-hour meters at Saitama Plant.

March 1999

Obtained ISO-9001 certification at Iwate and Chiba Plant.

July 2000

Concentrated functions of R&D center and manufacturing division at Saitama Plant.

August 2000

Osaki Electric Systems Co., Ltd. and Iwate Osaki Electric Co., Ltd. started business operations.

March 2001

Obtained ISO-9001 certificateion at Saitama Plant.

February 2002

Obtained ISO-14001 certification at Saitama Plant.

November 2002

Acquired Itron Datatech Co., Ltd. in Chuo Ward, Tokyo (later moved to Shinagawa Ward) (currently Osaki Datatech Co., Ltd. ) became consolidated subsidiary of Osaki Electric Co., Ltd.

February 2007

Enagate Co., Ltd in Osaka became consolidated subsidiary of Osaki Electric Co., Ltd.

February 2012

SMB United Limited(currently "OSAKI United International Pte. Ltd.") in Singapore became consolidated subsidiary of Osaki Electric Co., Ltd.

March 2017

Obtained ISO-27001 certification in energy management business domain.