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Demand ventilation system
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Patent number 5,791,983
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Issue date Aug 11, 1998
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Healthy Buildings International
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Gray Robertson
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F24 - HEATING RANGES VENTILATING
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Smoker's module
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Patent number 5,472,466
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Issue date Dec 5, 1995
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James H. Oler
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F24 - HEATING RANGES VENTILATING
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Air quality conditioning system
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Patent number 5,261,596
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Issue date Nov 16, 1993
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Matsushita Electric Industrial Co., Ltd.
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Hirokazu Tachibana
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F24 - HEATING RANGES VENTILATING
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2701312
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Patent number 2,701,312
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Issue date Feb 1, 1955
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F24 - HEATING RANGES VENTILATING