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Digital tone control arrangement
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Patent number 4,580,237
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Issue date Apr 1, 1986
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U.S. Philips Corporation
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Ludwig D. J. Eggermont
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H03 - BASIC ELECTRONIC CIRCUITRY
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Digital adding device
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Patent number 4,229,802
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Issue date Oct 21, 1980
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U.S. Philips Corporation
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Ludwig D. J. Eggermont
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G06 - COMPUTING CALCULATING COUNTING
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Integrating code converter
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Patent number 4,167,731
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Issue date Sep 11, 1979
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U.S. Philips Corporation
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Ludwig D. J. Eggermont
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H03 - BASIC ELECTRONIC CIRCUITRY
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Delta-modulation encoder
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Patent number 4,109,203
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Issue date Aug 22, 1978
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U.S. Philips Corporation
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Ludwig Desire Johan Eggermont
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H03 - BASIC ELECTRONIC CIRCUITRY
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Interpolating digital filter
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Patent number 3,988,607
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Issue date Oct 26, 1976
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U.S. Philips Corporation
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Ludwig Desire Johan Eggermont
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H03 - BASIC ELECTRONIC CIRCUITRY