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Hub for a plastic blower impeller
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Patent number 4,943,209
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Issue date Jul 24, 1990
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Heil-Quaker Corporation
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Richard F. Beehler
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F04 - POSITIVE DISPLACEMENT MACHINES FOR LIQUIDS PUMPS FOR LIQUIDS OR ELASTIC...
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Blower with clam shell housing
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Patent number 4,865,517
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Issue date Sep 12, 1989
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Heil-Quaker Corporation
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Richard F. Beehler
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F04 - POSITIVE DISPLACEMENT MACHINES FOR LIQUIDS PUMPS FOR LIQUIDS OR ELASTIC...
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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...