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Framing structure
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Patent number 4,628,648
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Issue date Dec 16, 1986
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American Welding & Manufacturing Co.
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Rodney W. Winyard
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E06 - DOORS, WINDOWS, SHUTTERS, OR ROLLER BLINDS IN GENERAL LADDERS
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Steel door frame with thermal break
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Patent number 4,594,831
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Issue date Jun 17, 1986
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American Welding & Manufacturing Co.
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Rodney W. Winyard
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E06 - DOORS, WINDOWS, SHUTTERS, OR ROLLER BLINDS IN GENERAL LADDERS