History

We are making the history of thermistors by accumulating assured technologies and achievements.

We were originally Nippon Contact Point and were established for manufacturing high-performance electric contacts for aircraft on August 13, 1939, and then changed the name to Ohizumi Aircraft Equipment Manufacturing Co., Ltd., on March 25, 1944.

After WW II, we changed our name to the present name, Ohizumi Mfg. Co., Ltd., in October 1945, started manufacturing electric contacts for civilian use, started research and development by receiving trial production requests for thermistors from the Research Institute of Telecommunication of the Ministry of Telecommunication in February 1952, and started manufacturing thermistors for telephone switchboards in January 1955. Since then, we have worked on the development of various types of temperature sensors based on the accumulation of technologies of semiconducting ceramic, metal, plastic, and glass, and have been making efforts to supply high-quality products for over 50 years.

March 1944
Ohizumi Aircraft Equipment Manufacturing Co., Ltd., established in Itabashi Ward, Tokyo for the purpose of manufacturing and selling electric contacts for aircraft
October 1945
Trade name changed to Ohizumi Mfg. Co., Ltd., and the head office moved to Nerima City, Tokyo metropolis
January 1955
Started manufacturing of NTC (negative temperature coefficient) thermistors
December 1966
Subsidiary company Towada Denshi Co., Ltd., (currently, Towada Plant) established in Towada City, Aomori Prefecture
October 1981
Gonohe Denshi Kogyo Co., Ltd., (currently, Sensor Kogyo Co., Ltd., Gonohe Plant) established in Gonohe Town, Sannohe County, Aomori Prefecture
January 1984
Subsidiary company Hakkoda Denshi Co., Ltd., established in Towada City, Aomori Prefecture
May 1985
Subsidiary company Sensor Kogyo Co., Ltd., (currently, Sensor Kogyo Co., Ltd., 1st Plant) established in Towada City, Aomori Prefecture
April 1987
Started manufacturing of PTC (positive temperature coefficient) thermistors
June 1989
Hachinohe Denshi Kogyo Co., Ltd., (currently, Sensor Kogyo Co., Ltd., Hachinohe Plant) established in Hachinohe City, Aomori Prefecture
November 1996
Opened Tokyo Sales Office in Takadanobaba, Shinjuku City, Tokyo Metropolis
August 2003
Head office moved to Sayama City, Saitama Prefecture
January 2004
Subsidiary company, Dongguan Ohizumi Sensor Co., Ltd., established at Boyong Community, Humen Town, Dongguan City, Guangdong Province, China
June 2012
Listed on Tokyo Stock Exchange Mothers market
November 2013
Opened Kariya Sales Office in Kariya City, Aichi Prefecture
May 2014
Opened Kyoto Sales Office in Shimogyo Ward, Kyoto City, Kyoto Prefecture
December 2014
Plant of subsidiary company Ohizumu Mfg. (Thailand) Co., Ltd., in Chonburi, Thailand started operation
February 2017
Opened Dongguan Ohizumi Sensor Co., Ltd., Liaison Office in Shanghai, China
April 2017
Opened Representative Office Europe in Stuttgart, Germany
May 2017
Opened Engineering Center in site of Towada Plant
March 2019
New plant building completed in Towada
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