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Connector for spaced metal parts
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Patent number 4,158,512
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Issue date Jun 19, 1979
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Wilhelm Hasselbacher
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E06 - DOORS, WINDOWS, SHUTTERS, OR ROLLER BLINDS IN GENERAL LADDERS
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Connector for metal parts
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Patent number 4,157,641
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Issue date Jun 12, 1979
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Wilhelm Hasselbacher
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E06 - DOORS, WINDOWS, SHUTTERS, OR ROLLER BLINDS IN GENERAL LADDERS