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A61 - MEDICAL OR VETERINARY SCIENCE HYGIENE
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Patent number 3,810,941
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A61 - MEDICAL OR VETERINARY SCIENCE HYGIENE
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C07 - ORGANIC CHEMISTRY
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A61 - MEDICAL OR VETERINARY SCIENCE HYGIENE
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2959550
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Patent number 2,959,550
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A23 - FOODS OR FOODSTUFFS THEIR TREATMENT, NOT COVERED BY OTHER CLASSES
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