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3266192
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Patent number 3,266,192
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Issue date Aug 16, 1966
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E06 - DOORS, WINDOWS, SHUTTERS, OR ROLLER BLINDS IN GENERAL LADDERS
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Patent number 2,923,963
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Issue date Feb 9, 1960
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E06 - DOORS, WINDOWS, SHUTTERS, OR ROLLER BLINDS IN GENERAL LADDERS
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E06 - DOORS, WINDOWS, SHUTTERS, OR ROLLER BLINDS IN GENERAL LADDERS
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2260534
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Issue date Oct 28, 1941
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F24 - HEATING RANGES VENTILATING