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Spiral spacer
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Patent number 5,458,943
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Issue date Oct 17, 1995
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Donald M. Taylor
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E06 - DOORS, WINDOWS, SHUTTERS, OR ROLLER BLINDS IN GENERAL LADDERS
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Ribbon type spacer/seal system
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Patent number 5,302,425
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Issue date Apr 12, 1994
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Donald M. Taylor
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E06 - DOORS, WINDOWS, SHUTTERS, OR ROLLER BLINDS IN GENERAL LADDERS
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Insulative spacer/seal system
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Patent number 5,290,611
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Issue date Mar 1, 1994
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Donald M. Taylor
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E06 - DOORS, WINDOWS, SHUTTERS, OR ROLLER BLINDS IN GENERAL LADDERS
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Frame system
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Patent number 4,977,722
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Issue date Dec 18, 1990
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Repla Limited
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Donald M. Taylor
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E06 - DOORS, WINDOWS, SHUTTERS, OR ROLLER BLINDS IN GENERAL LADDERS