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2333692
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Patent number 2,333,692
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Issue date Nov 9, 1943
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B65 - CONVEYING PACKING STORING HANDLING THIN OR FILAMENTARY MATERIAL
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2070881
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Patent number 2,070,881
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Issue date Feb 16, 1937
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B65 - CONVEYING PACKING STORING HANDLING THIN OR FILAMENTARY MATERIAL