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Cordless telephone
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Patent number 4,650,931
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Issue date Mar 17, 1987
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Sony Corporation
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Keizo Tsukada
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H04 - ELECTRIC COMMUNICATION TECHNIQUE
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Cordless telephone
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Patent number 4,640,987
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Issue date Feb 3, 1987
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Keizo Tsukada
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H04 - ELECTRIC COMMUNICATION TECHNIQUE
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Cordless telephone
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Patent number 4,639,550
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Issue date Jan 27, 1987
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Sony Corporation
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Masato Yamagawa
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H04 - ELECTRIC COMMUNICATION TECHNIQUE
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Timer circuit
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Patent number 4,267,467
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Issue date May 12, 1981
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Sony Corporation
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Keizo Tsukada
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H03 - BASIC ELECTRONIC CIRCUITRY
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Power amplifier circuit
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Patent number 4,205,274
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Issue date May 27, 1980
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Sony Corporation
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Keizo Tsukada
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H03 - BASIC ELECTRONIC CIRCUITRY