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Pivotal ladder
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Patent number 5,163,531
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Issue date Nov 17, 1992
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Whiting Roll-Up Door Mfg. Corp.
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Lauren C. Whiting
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E06 - DOORS, WINDOWS, SHUTTERS, OR ROLLER BLINDS IN GENERAL LADDERS
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Roller assembly
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Patent number 4,379,479
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Issue date Apr 12, 1983
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Whiting Roll-Up Door Mfg. Corp.
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Lauren C. Whiting
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B60 - VEHICLES IN GENERAL
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Roller assembly
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Patent number 4,306,756
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Issue date Dec 22, 1981
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Whiting Roll-Up Door Mfg. Corp.
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Lauren C. Whiting
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F16 - ENGINEERING ELEMENTS AND UNITS GENERAL MEASURES FOR PRODUCING AND MAINT...
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Upwardly-acting door structure
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Patent number 3,977,123
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Issue date Aug 31, 1976
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Whiting Roll-Up Door Mfg. Corporation
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Roy T. Clay
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E05 - LOCKS KEYS WINDOW OR DOOR FITTINGS SAFES