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Solar heating control
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Patent number 4,349,012
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Issue date Sep 14, 1982
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Research Products Corporation
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Richard J. Schildknecht
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F24 - HEATING RANGES VENTILATING
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Solar heating system
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Patent number 4,187,834
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Issue date Feb 12, 1980
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Power Systems Development Corporation
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Walter W. Hoinski
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F24 - HEATING RANGES VENTILATING
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2244631
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Patent number 2,244,631
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Issue date Jun 3, 1941
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F24 - HEATING RANGES VENTILATING
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1902303
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Patent number 1,902,303
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Issue date Mar 21, 1933
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F24 - HEATING RANGES VENTILATING