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3395984
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Patent number 3,395,984
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Issue date Aug 6, 1968
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C01 - INORGANIC CHEMISTRY
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2646344
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Patent number 2,646,344
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Issue date Jul 21, 1953
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C01 - INORGANIC CHEMISTRY
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2375638
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Patent number 2,375,638
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Issue date May 8, 1945
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C01 - INORGANIC CHEMISTRY
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1336974
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Patent number 1,336,974
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Issue date Apr 13, 1920
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C01 - INORGANIC CHEMISTRY