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Heat pump system
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Patent number RE31281
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Issue date Jun 21, 1983
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Consolidated Natural Gas Service Company, Inc.
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Paul F. Swenson
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062 - Refrigeration
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Heat pump system
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Patent number 4,312,188
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Issue date Jan 26, 1982
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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 pump system
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Patent number 4,178,772
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Issue date Dec 18, 1979
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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 pump system
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Patent number 4,055,964
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Issue date Nov 1, 1977
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Consolidated Natural Gas Service Company
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Paul F. Swenson
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F24 - HEATING RANGES VENTILATING