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Encrypted communication system
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Patent number 5,222,136
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Issue date Jun 22, 1993
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Crest Industries, Inc.
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Harry R. Rasmussen
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H04 - ELECTRIC COMMUNICATION TECHNIQUE
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Key telephone system
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Patent number 4,133,985
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Issue date Jan 9, 1979
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Crest Industries, Inc.
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Harry R. Rasmussen
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H04 - ELECTRIC COMMUNICATION TECHNIQUE
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Pull-out receptacle for floor ducts
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Patent number 4,059,321
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Issue date Nov 22, 1977
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Crest Industries, Inc.
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Harry R. Rasmussen
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H02 - GENERATION CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
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