OKI’s Challenge: Connecting the Voices of Japan
- 1940
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- Establishes Oki Communications Equipment Co., Ltd.
- 1941
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- Completes construction of Takahama Plant
- Pacific War begins
- 1942
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- 1944
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- Senkichi Ozawa appointed president
- Shibaura and Takahama plants designated "munitions" plants
- 1945
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- Buildings in Shibaura Plant destroyed in air raids
- Second World War ends
- Concentrates production in five plants — Fukushima, Shibaura, Shinagawa, Tomioka, and Warabi
- Yuzo Yanai appointed president
- 1946
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- Oki Electric Workers' Union established
- GHQ designates Oki Electric "restricted concern"
- GHQ designates Oki Electric and Oki Electric Securities "olding companies"
- 1947
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- Ryoji Inoue appointed president
- 1948
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- Ryoji Inoue passes away while still president
- 1949
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- Yuzo Yanai reappointed president
- Oki Electric Co., Ltd., dissolved, and Oki Electric Industry Co., Ltd., established; Suteji Kanbe appointed president
- 1950
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- Korean War begins
- Begins mass production of Type-4 telephone
- 1951
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- Lists shares on Tokyo Stock Exchange
- 1953
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- Mito Telegraph Office uses Oki Electric product to complete first automated telegraph repeating
- Markets page teletypewriter
- Resumes production at Shibaura Plant
- 1954
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- Signs technical assistance agreement related to carrier telephones and telegraph equipment with Compagnie Industrielle des Telephones
- Signs technical assistance agreement related to radar technology, especially shipborne radio equipment, with Raytheon
- 1955
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- Develops millimeter wave magnetron
- 1956
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- Produces 100-line Ericsson-type crossbar-switching system for in-house use
- Delivers Ericsson-type crossbar-switching system for use at Ryuo Station in Yamanashi Prefecture
- Begins research into transistors and electronic exchanges
- 1957
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- Establishes Oki Business Machines Sales Co., Ltd.
- Begins research into electronic computers
- 1958
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- Develops millimeter wave klystron
- Adopts new plant system
- Completes construction of Takasaki Plant
- Develops belt line printer, photoelectric tape reader, and general-use I/O device
- 1959
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- Signs patent licensing contract with WE for production of crossbar exchanges
- Completes development of OPC1 computer using parametrons
