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History of the manufacturer  

Ohkura Electric Co. (OEC); Sakado

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Name: Ohkura Electric Co. (OEC); Sakado    (J)  
Abbreviation: ohkura
Products: Model types Tube manufacturer

Ohkura Electric Co. Ltd.
Head Office/Factory: 1-4-4 Nissaihanamizuki, Sakado-shi, Saitama-ken 350-0269, Japan

Product range: Industrial Instrument, Telemetering and Control, Semiconductor Equipment

Founded: 1933

(Ohkura website:)

1933 July: Established as the Ohkura Electric Research Institute, an affiliate of the Henmi Bamboo Slide Rule Campany.
1936 December: Incorporated as the Ohkura Electric Research Institute, Ltd.
1943 December: Changed company name to Ohkura Electric Co.,Ltd.
1947 February: Built Tokyo Factory in Suginami-ku, Tokyo
1964 February: Built Sakado Factory in Sakado, Saitama
1984 May: Opened the Wako Technology Center in Wako Saitama.
1986 December: Built Misato Factory in Misato-Machi, Kodama-gun, Saitama
1990 October: Built Hokkaido Plant in Eniwa, Hokkaido.
2001 May: Moved the head office to Wako, Saitama
2002 January: Sold the Telecommunication Systems Department
2002 July: Moved the head office to Misato, Saitama
2004 April: Built head office/factory in Sakado, Saitama
2005 August: Built second factory in Sakado,Saitama 
2013 November: Ohkura Electric Co., Ltd became a consolidated Subsidiary of Y.A.C. Co., Ltd. through stock acquisition

This manufacturer was suggested by Otmar Jung.