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Insulated heater module
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Patent number 4,473,034
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Issue date Sep 25, 1984
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Amana Refrigeration, Inc.
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James H. Raudabaugh
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F24 - HEATING RANGES VENTILATING
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Method of fabricating a solar heating unit
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Patent number 4,072,262
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Issue date Feb 7, 1978
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Kennecott Copper Corporation
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Joseph A. Godrick
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B21 - MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL PUNCHING...
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Solar energy absorber panel
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Patent number 3,987,784
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Issue date Oct 26, 1976
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Kennecott Copper Corporation
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Joseph A. Godrick
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F24 - HEATING RANGES VENTILATING