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Video luminance self keyer
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Patent number 4,947,255
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Issue date Aug 7, 1990
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The Grass Valley Group, Inc.
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Richard A. Jackson
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H04 - ELECTRIC COMMUNICATION TECHNIQUE
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Monolithic switch
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Patent number 4,663,598
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Issue date May 5, 1987
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The Grass Valley Group
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Birney D. Dayton
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H03 - BASIC ELECTRONIC CIRCUITRY
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Chroma keying system
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Patent number 4,319,266
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Issue date Mar 9, 1982
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The Grass Valley Group, Inc.
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Richard S. Bannister
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H04 - ELECTRIC COMMUNICATION TECHNIQUE