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Authorising coded signals
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Patent number 4,864,614
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Issue date Sep 5, 1989
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U.S. Philips Corporation
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Gerald O. Crowther
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H04 - ELECTRIC COMMUNICATION TECHNIQUE
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Scrambled television signals
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Patent number 4,727,579
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Issue date Feb 23, 1988
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U.S. Philips Corporation
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Derek T. Wright
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H04 - ELECTRIC COMMUNICATION TECHNIQUE
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Television transmission system
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Patent number 4,651,205
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Issue date Mar 17, 1987
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U.S. Philips Corporation
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Gerald O. Crowther
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H04 - ELECTRIC COMMUNICATION TECHNIQUE
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Transmission system
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Patent number 4,636,854
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Issue date Jan 13, 1987
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U.S. Philips Corporation
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Gerald O. Crowther
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H04 - ELECTRIC COMMUNICATION TECHNIQUE
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