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Ventilator
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Patent number 4,759,272
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Issue date Jul 26, 1988
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Michel Zaniewski
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F24 - HEATING RANGES VENTILATING
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Unidirectional vent
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Patent number 4,567,816
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Issue date Feb 4, 1986
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Suroff; Leonard W.
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Stanley Kolt
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F24 - HEATING RANGES VENTILATING
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Fluid flow control means
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Patent number 4,377,968
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Issue date Mar 29, 1983
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Ulric K. Gerry
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F24 - HEATING RANGES VENTILATING
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3641915
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Patent number 3,641,915
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Issue date Feb 15, 1972
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F24 - HEATING RANGES VENTILATING