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Security shutter system
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Patent number 5,070,925
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Issue date Dec 10, 1991
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Prime Marketing Group, Inc.
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Helmut Paule
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E06 - DOORS, WINDOWS, SHUTTERS, OR ROLLER BLINDS IN GENERAL LADDERS
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Shutter slat configuration
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Patent number 4,343,340
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Issue date Aug 10, 1982
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Prime Marketing Group, Inc.
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Helmut Paule
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E06 - DOORS, WINDOWS, SHUTTERS, OR ROLLER BLINDS IN GENERAL LADDERS