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3757006
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Patent number 3,757,006
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Issue date Sep 4, 1973
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C07 - ORGANIC CHEMISTRY
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3462418
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Patent number 3,462,418
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Issue date Aug 19, 1969
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A61 - MEDICAL OR VETERINARY SCIENCE HYGIENE
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3340253
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Patent number 3,340,253
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Issue date Sep 5, 1967
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A61 - MEDICAL OR VETERINARY SCIENCE HYGIENE
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3312688
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Patent number 3,312,688
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Issue date Apr 4, 1967
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A61 - MEDICAL OR VETERINARY SCIENCE HYGIENE