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Flapper check valve
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Patent number 4,951,706
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Issue date Aug 28, 1990
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Fulton Thermatec Corporation
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Peter Kardos
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F16 - ENGINEERING ELEMENTS AND UNITS GENERAL MEASURES FOR PRODUCING AND MAINT...
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Process for pulse combustion
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Patent number 4,926,798
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Issue date May 22, 1990
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Gas Research Institute
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Peter Kardos
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F24 - HEATING RANGES VENTILATING
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Pulse combustor
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Patent number 4,884,963
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Issue date Dec 5, 1989
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Gas Research Institute
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Peter Kardos
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F24 - HEATING RANGES VENTILATING
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Flapper control valve
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Patent number 4,856,558
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Issue date Aug 15, 1989
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Gas Research Institute
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Peter Kardos
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F02 - COMBUSTION ENGINES HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS