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3666081
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Patent number 3,666,081
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Issue date May 30, 1972
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B65 - CONVEYING PACKING STORING HANDLING THIN OR FILAMENTARY MATERIAL
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3263798
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Patent number 3,263,798
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Issue date Aug 2, 1966
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B65 - CONVEYING PACKING STORING HANDLING THIN OR FILAMENTARY MATERIAL