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Signal discrimination circuit
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Patent number 5,757,513
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Issue date May 26, 1998
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Sharp Kabushiki Kaisha
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Michio Ikeuchi
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H04 - ELECTRIC COMMUNICATION TECHNIQUE
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DTMF signal judging apparatus
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Patent number 5,592,544
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Issue date Jan 7, 1997
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Sharp Kabushiki Kaisha
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Yasumoto Murata
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H04 - ELECTRIC COMMUNICATION TECHNIQUE
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DTMF signal judging apparatus
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Patent number 5,588,052
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Issue date Dec 24, 1996
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Sharp Kabushiki Kaisha
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Yasumoto Murata
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H04 - ELECTRIC COMMUNICATION TECHNIQUE
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Signal discrimination circuit
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Patent number 5,343,420
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Issue date Aug 30, 1994
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Sharp Kabushiki Kaisha
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Yasumoto Murata
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H04 - ELECTRIC COMMUNICATION TECHNIQUE
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Phase shift angle detector
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Patent number 5,068,876
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Issue date Nov 26, 1991
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Sharp Kabushiki Kaisha
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Shuuichi Yoshikawa
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H03 - BASIC ELECTRONIC CIRCUITRY