| 1941 |
- Plant requisitioned by Army Aerial Headquarters
- Begins production of military communications equipment
- Markets SB-500 5-tube "Super Radio" featuring push-button station selection
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- Pacific War begins (December 8)
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| 1942 |
- Changes company name to Hayakawa Electric Industry Co., Ltd.
- Establishes new research laboratory to study short-wave and ultra-short wave technology
- Begins production of aerial radio equipment
- Makes Lighthouse Factory, which employed ex-soldiers blinded during war, auxiliary plant of the company
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| 1944 |
- Establishes plant in Izumi-Fuchu, Osaka
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| 1945 |
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- Establishes Kyoto Plant
- United Nations established (October 24)
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| 1946 |
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- World's first electronic calculator built at University of Pennsylvania, US
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| 1947 |
- Sells Kyoto and Izumi-Fuchu plants
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- Promulgation of Japanese Constitution (May 3)
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| 1948 |
- Invention of the transistor in the US
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| 1949 |
- Public stock offering, company listed on Osaka Stock Exchange
- Markets PR-2 portable radio
- Markets H-185 portable collapsible electric iron
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- Dodge Line
- Hideki Yukawa awarded Nobel Prize for physics (December 10)
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| 1950 |
- Faces fear of bankruptcy
- Plant for the blind incorporated and becomes Tokusen Metal Limited Partnership (now Sharp Tokusen Industry Co.), a jointly capitalized corporation with capital of 150,000 yen (August)
- Markets new "Super Radio"
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- Korean War begins (June 25)
- Tokyo Telecommunications Engineering Corporation (now Sony Corporation) markets tape recorder
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