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3497315
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C01 - INORGANIC CHEMISTRY
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A61 - MEDICAL OR VETERINARY SCIENCE HYGIENE
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Patent number 2,712,491
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Issue date Jul 5, 1955
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C01 - INORGANIC CHEMISTRY
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Patent number 2,712,492
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C01 - INORGANIC CHEMISTRY
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C01 - INORGANIC CHEMISTRY