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Optical switch
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Patent number 4,715,673
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Issue date Dec 29, 1987
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Hitachi, Ltd.
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Takanobu Noro
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G02 - OPTICS
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Gas detecting apparatus
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Patent number 4,638,443
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Issue date Jan 20, 1987
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Hitachi, Ltd.
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Masayoshi Kaneyasu
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G08 - SIGNALLING
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Gas detecting apparatus
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Patent number 4,586,143
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Issue date Apr 29, 1986
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Hitachi, Ltd.
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Masayoshi Kaneyasu
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G01 - MEASURING TESTING
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Gas detector
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Patent number 4,481,499
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Issue date Nov 6, 1984
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Hitachi, Ltd.
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Hideo Arima
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G01 - MEASURING TESTING
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Thermistor composition
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Patent number 4,347,166
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Issue date Aug 31, 1982
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Hitachi, Ltd.
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Hiromi Tosaki
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H01 - BASIC ELECTRIC ELEMENTS