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3798869
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Patent number 3,798,869
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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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3579724
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Patent number 3,579,724
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Issue date May 25, 1971
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E06 - DOORS, WINDOWS, SHUTTERS, OR ROLLER BLINDS IN GENERAL LADDERS
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3517472
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Patent number 3,517,472
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Issue date Jun 30, 1970
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E06 - DOORS, WINDOWS, SHUTTERS, OR ROLLER BLINDS IN GENERAL LADDERS