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3468504
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Patent number 3,468,504
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Issue date Sep 23, 1969
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B65 - CONVEYING PACKING STORING HANDLING THIN OR FILAMENTARY MATERIAL
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2610728
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Patent number 2,610,728
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Issue date Sep 16, 1952
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B65 - CONVEYING PACKING STORING HANDLING THIN OR FILAMENTARY MATERIAL