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A61 - MEDICAL OR VETERINARY SCIENCE HYGIENE
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Patent number 3,666,803
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A61 - MEDICAL OR VETERINARY SCIENCE HYGIENE
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3644409
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A61 - MEDICAL OR VETERINARY SCIENCE HYGIENE
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3553259
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Patent number 3,553,259
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A61 - MEDICAL OR VETERINARY SCIENCE HYGIENE
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Patent number 3,484,481
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A61 - MEDICAL OR VETERINARY SCIENCE HYGIENE
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A61 - MEDICAL OR VETERINARY SCIENCE HYGIENE
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Patent number 3,212,973
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A61 - MEDICAL OR VETERINARY SCIENCE HYGIENE
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A61 - MEDICAL OR VETERINARY SCIENCE HYGIENE
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A61 - MEDICAL OR VETERINARY SCIENCE HYGIENE
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A61 - MEDICAL OR VETERINARY SCIENCE HYGIENE
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A61 - MEDICAL OR VETERINARY SCIENCE HYGIENE