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3885371
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Patent number 3,885,371
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Issue date May 27, 1975
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E06 - DOORS, WINDOWS, SHUTTERS, OR ROLLER BLINDS IN GENERAL LADDERS
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3689970
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Patent number 3,689,970
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Issue date Sep 12, 1972
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B21 - MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL PUNCHING...
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2622710
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Patent number 2,622,710
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Issue date Dec 23, 1952
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B21 - MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL PUNCHING...