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Data link control method
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Patent number 5,737,332
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Issue date Apr 7, 1998
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Motorola, Inc.
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Richard J. Corrigan
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H04 - ELECTRIC COMMUNICATION TECHNIQUE
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Key management system
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Patent number 5,173,938
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Issue date Dec 22, 1992
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Motorola, Inc.
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Kurt W. Steinbrenner
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H04 - ELECTRIC COMMUNICATION TECHNIQUE
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Key management system
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Patent number 5,093,860
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Issue date Mar 3, 1992
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Motorola, Inc.
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Kurt W. Steinbrenner
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H04 - ELECTRIC COMMUNICATION TECHNIQUE