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Attachment to a ladder
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Patent number 4,440,263
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Issue date Apr 3, 1984
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Samuel D. Smith
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E06 - DOORS, WINDOWS, SHUTTERS, OR ROLLER BLINDS IN GENERAL LADDERS
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Safety device for ladders
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Patent number 4,406,350
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Issue date Sep 27, 1983
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Samuel D. Smith
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E06 - DOORS, WINDOWS, SHUTTERS, OR ROLLER BLINDS IN GENERAL LADDERS