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Rack and chain lifting device
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Patent number 10,669,139
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Issue date Jun 2, 2020
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Halls Labs LLC
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David R. Hall
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F16 - ENGINEERING ELEMENTS AND UNITS GENERAL MEASURES FOR PRODUCING AND MAINT...
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Track system for retractable wall
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Patent number 10,662,705
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Issue date May 26, 2020
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Hall Labs LLC
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David R. Hall
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E06 - DOORS, WINDOWS, SHUTTERS, OR ROLLER BLINDS IN GENERAL LADDERS
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Corner rack
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Patent number 10,281,015
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Issue date May 7, 2019
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Hall Labs LLC
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David R. Hall
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B66 - HOISTING LIFTING HAULING
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