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Heating unit
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Patent number 4,493,270
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Issue date Jan 15, 1985
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Arthur P. Gamroth
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F24 - HEATING RANGES VENTILATING
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Chimney sentinel
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Patent number 4,455,996
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Issue date Jun 26, 1984
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Louis V. Achilles
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F23 - COMBUSTION APPARATUS COMBUSTION PROCESSES
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Cyclonic furnace
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Patent number 4,166,421
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Issue date Sep 4, 1979
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Heenan Environmental Systems Ltd.
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John B. Stribling
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F23 - COMBUSTION APPARATUS COMBUSTION PROCESSES
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2711710
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Patent number 2,711,710
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Issue date Jun 28, 1955
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F23 - COMBUSTION APPARATUS COMBUSTION PROCESSES