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Fuel-fired heat pump system
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Patent number 5,192,022
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Issue date Mar 9, 1993
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Consolidated Natural Gas Service Company, Inc.
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Paul F. Swenson
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F24 - HEATING RANGES VENTILATING
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Heat control systems
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Patent number 4,231,516
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Issue date Nov 4, 1980
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Charles E. Weingartner
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F24 - HEATING RANGES VENTILATING
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Heating system
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Patent number 4,141,490
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Issue date Feb 27, 1979
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Antonino Franchina
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F24 - HEATING RANGES VENTILATING
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