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3923997
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C07 - ORGANIC CHEMISTRY
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3541078
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A61 - MEDICAL OR VETERINARY SCIENCE HYGIENE
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2289974
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Patent number 2,289,974
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Issue date Jul 14, 1942
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A01 - AGRICULTURE FORESTRY ANIMAL HUSBANDRY HUNTING TRAPPING FISHING
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2127879
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Patent number 2,127,879
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Issue date Aug 23, 1938
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C07 - ORGANIC CHEMISTRY