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Window structure
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Patent number 5,410,846
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Issue date May 2, 1995
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Harry Frambach
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E06 - DOORS, WINDOWS, SHUTTERS, OR ROLLER BLINDS IN GENERAL LADDERS
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Window system and structure
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Patent number 5,038,537
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Issue date Aug 13, 1991
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Harry Frambach
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E06 - DOORS, WINDOWS, SHUTTERS, OR ROLLER BLINDS IN GENERAL LADDERS