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2869991
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Patent number 2,869,991
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Issue date Jan 20, 1959
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B65 - CONVEYING PACKING STORING HANDLING THIN OR FILAMENTARY MATERIAL
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2788263
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Patent number 2,788,263
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Issue date Apr 9, 1957
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B01 - PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
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2621112
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Patent number 2,621,112
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Issue date Dec 9, 1952
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C10 - PETROLEUM, GAS OR COKE INDUSTRIES TECHNICAL GASES CONTAINING CARBON MON...