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Structure of a venetian blind
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Patent number 6,234,235
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Issue date May 22, 2001
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Nien Ming
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E06 - DOORS, WINDOWS, SHUTTERS, OR ROLLER BLINDS IN GENERAL LADDERS
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Venetian blind controller
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Patent number 4,914,360
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Issue date Apr 3, 1990
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Chi-Sheng Hsieh
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E06 - DOORS, WINDOWS, SHUTTERS, OR ROLLER BLINDS IN GENERAL LADDERS