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Cathode in a cathode ray tube
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Patent number 5,122,707
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Issue date Jun 16, 1992
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Mitsubishi Denki Kabushiki Kaisha
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Hisao Nakanishi
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H01 - BASIC ELECTRIC ELEMENTS
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Cathode for electron tube
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Patent number 4,924,137
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Issue date May 8, 1990
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Mitsubishi Denki Kabushiki Kaisha
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Keiji Watanabe
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H01 - BASIC ELECTRIC ELEMENTS
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Hot cathode in wire form
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Patent number 4,897,574
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Issue date Jan 30, 1990
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Mitsubishi Denki Kabushiki Kaisha
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Masato Saito
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H01 - BASIC ELECTRIC ELEMENTS
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Cathode for electron tube
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Patent number 4,797,593
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Issue date Jan 10, 1989
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Mitsubishi Denki Kabushiki Kaisha
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Masato Saito
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H01 - BASIC ELECTRIC ELEMENTS