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Repeater overload circuit
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Patent number 4,253,131
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Issue date Feb 24, 1981
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Bell Telephone Laboratories, Incorporated
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Barry S. Bosik
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H04 - ELECTRIC COMMUNICATION TECHNIQUE
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Repeater level control circuit
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Patent number 4,229,625
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Issue date Oct 21, 1980
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Bell Telephone Laboratories, Incorporated
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Jeffrey H. Derby
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H04 - ELECTRIC COMMUNICATION TECHNIQUE
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Converter drive circuit
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Patent number 4,220,987
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Issue date Sep 2, 1980
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Bell Telephone Laboratories, Incorporated
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Tadikonda N. Rao
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H02 - GENERATION CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
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Telephone ringing generators
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Patent number 4,015,091
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Issue date Mar 29, 1977
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Bell Telephone Laboratories, Incorporated
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Tadikonda Narasimha Rao
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H04 - ELECTRIC COMMUNICATION TECHNIQUE