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Split tuning filter
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Patent number 4,451,803
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Issue date May 29, 1984
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Eagle Comtronics, Inc.
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Timothy M. Holdsworth
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H03 - BASIC ELECTRONIC CIRCUITRY
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Smoke detector
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Patent number 4,104,619
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Issue date Aug 1, 1978
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General Electric Company
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Joseph P. Hesler
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G08 - SIGNALLING
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Inverter transformer
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Patent number 4,004,251
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Issue date Jan 18, 1977
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General Electric Company
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Joseph P. Hesler
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H02 - GENERATION CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
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Automatic gain control system
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Patent number 3,936,599
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Issue date Feb 3, 1976
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General Electric Company
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William Peil
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H04 - ELECTRIC COMMUNICATION TECHNIQUE