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Ventilation fan
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Patent number 4,261,255
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Issue date Apr 14, 1981
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Heil-Quaker Corporation
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Richard M. Anderson
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F24 - HEATING RANGES VENTILATING
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Damper mechanism for fresh air intake
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Patent number 4,200,117
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Issue date Apr 29, 1980
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Heil-Quaker Corporation
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Richard M. Anderson
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F16 - ENGINEERING ELEMENTS AND UNITS GENERAL MEASURES FOR PRODUCING AND MAINT...
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Air conditioner control
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Patent number 4,045,973
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Issue date Sep 6, 1977
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Heil-Quaker Corporation
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Richard M. Anderson
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F24 - HEATING RANGES VENTILATING
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Air conditioner control
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Patent number 4,038,061
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Issue date Jul 26, 1977
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Heil-Quaker Corporation
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Richard M. Anderson
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F24 - HEATING RANGES VENTILATING
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Air conditioner control
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Patent number 4,034,570
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Issue date Jul 12, 1977
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Heil-Quaker Corporation
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Richard M. Anderson
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F24 - HEATING RANGES VENTILATING