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Solar collector
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Patent number 4,212,290
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Issue date Jul 15, 1980
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Warren L. Warnken
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F24 - HEATING RANGES VENTILATING
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Low-loss solar heat collectors
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Patent number 4,078,545
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Issue date Mar 14, 1978
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Metallgesellschaft Aktiengesellschaft
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Eduard Justi
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F24 - HEATING RANGES VENTILATING
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2402326
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Patent number 2,402,326
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Issue date Jun 18, 1946
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F24 - HEATING RANGES VENTILATING
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1747826
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Patent number 1,747,826
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Issue date Feb 18, 1930
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F24 - HEATING RANGES VENTILATING