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Telephone line circuit and system
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Patent number 4,456,991
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Issue date Jun 26, 1984
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International Telephone & Telegraph Corporation
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Ramon C. W. Chea
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H04 - ELECTRIC COMMUNICATION TECHNIQUE
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Semiconductor power component
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Patent number 4,110,780
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Issue date Aug 29, 1978
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BBC Brown Boveri & Company, Limited
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Jozef Cornu
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H01 - BASIC ELECTRIC ELEMENTS
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Semiconductor power component
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Patent number 3,987,479
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Issue date Oct 19, 1976
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BBC Brown Boveri & Company Limited
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Jozef Cornu
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H01 - BASIC ELECTRIC ELEMENTS