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Pre-amplifier
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Patent number 5,337,011
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Issue date Aug 9, 1994
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Knowles Electronics, Inc.
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John S. French
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H04 - ELECTRIC COMMUNICATION TECHNIQUE
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Automatic microphone mixer
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Patent number 5,259,035
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Issue date Nov 2, 1993
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Knowles Electronics, Inc.
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Richard W. Peters
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H04 - ELECTRIC COMMUNICATION TECHNIQUE
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Audio loudness control system
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Patent number 4,466,119
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Issue date Aug 14, 1984
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Industrial Research Products, Inc.
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Richard W. Peters
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H03 - BASIC ELECTRONIC CIRCUITRY
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Priority mixer control
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Patent number 4,149,032
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Issue date Apr 10, 1979
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Industrial Research Products, Inc.
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Richard W. Peters
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H04 - ELECTRIC COMMUNICATION TECHNIQUE
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