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Roman shades
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Patent number 4,921,032
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Issue date May 1, 1990
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Appropriate Technology Corporation
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David A. May
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E06 - DOORS, WINDOWS, SHUTTERS, OR ROLLER BLINDS IN GENERAL LADDERS
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Insulating window covering
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Patent number 4,418,739
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Issue date Dec 6, 1983
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Appropriate Technology Corporation
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James Woolnough
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E06 - DOORS, WINDOWS, SHUTTERS, OR ROLLER BLINDS IN GENERAL LADDERS