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3798862
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Patent number 3,798,862
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Issue date Mar 26, 1974
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E06 - DOORS, WINDOWS, SHUTTERS, OR ROLLER BLINDS IN GENERAL LADDERS
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Patent number 3,061,895
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Issue date Nov 6, 1962
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E06 - DOORS, WINDOWS, SHUTTERS, OR ROLLER BLINDS IN GENERAL LADDERS
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Patent number 1,486,167
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Issue date Mar 11, 1924
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E06 - DOORS, WINDOWS, SHUTTERS, OR ROLLER BLINDS IN GENERAL LADDERS