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Communication apparatus
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Patent number 5,774,495
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Issue date Jun 30, 1998
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Rohm Co., Ltd.
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Mitsuhiko Noda
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H04 - ELECTRIC COMMUNICATION TECHNIQUE
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DTMF signal receiving circuit
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Patent number 5,459,785
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Issue date Oct 17, 1995
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Rohm Co., Ltd.
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Mitsuhiko Noda
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H04 - ELECTRIC COMMUNICATION TECHNIQUE
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Directory answering machine
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Patent number 5,454,029
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Issue date Sep 26, 1995
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Rohm Co., Ltd.
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Mitsuhiko Noda
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H04 - ELECTRIC COMMUNICATION TECHNIQUE
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DTMF signal receiving system
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Patent number 5,363,439
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Issue date Nov 8, 1994
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Rohm Co., Ltd.
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Noda Mitsuhiko
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H04 - ELECTRIC COMMUNICATION TECHNIQUE
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