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Damper blade system
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Patent number 6,099,405
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Issue date Aug 8, 2000
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NRG Industries, Inc.
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Robert Ashley Cunningham
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F24 - HEATING RANGES VENTILATING
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Damper blade system
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Patent number 5,938,524
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Issue date Aug 17, 1999
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NRG Industries, Inc.
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Robert Ashley Cunningham
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F24 - HEATING RANGES VENTILATING
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Damper blade system
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Patent number 5,836,814
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Issue date Nov 17, 1998
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NRG Industries, Inc.
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Robert Ashley Cunningham
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F24 - HEATING RANGES VENTILATING
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Air handling system
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Patent number 5,548,970
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Issue date Aug 27, 1996
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NRG Industries Inc.
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Robert A. Cunningham
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F24 - HEATING RANGES VENTILATING
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