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Door control system and release mechanism
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Patent number 5,812,391
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Issue date Sep 22, 1998
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Solid State Securities, Inc.
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George M. Mehalshick
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E06 - DOORS, WINDOWS, SHUTTERS, OR ROLLER BLINDS IN GENERAL LADDERS
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Door control system and release mechanism
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Patent number 5,576,581
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Issue date Nov 19, 1996
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Solid State Securities, Inc.
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Nelson A. Iannuzzi
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E06 - DOORS, WINDOWS, SHUTTERS, OR ROLLER BLINDS IN GENERAL LADDERS