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3780897
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Patent number 3,780,897
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Issue date Dec 25, 1973
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B65 - CONVEYING PACKING STORING HANDLING THIN OR FILAMENTARY MATERIAL
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2488463
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Patent number 2,488,463
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Issue date Nov 15, 1949
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B65 - CONVEYING PACKING STORING HANDLING THIN OR FILAMENTARY MATERIAL