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3629081
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Patent number 3,629,081
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Issue date Dec 21, 1971
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C01 - INORGANIC CHEMISTRY
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3450617
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Patent number 3,450,617
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Issue date Jun 17, 1969
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C01 - INORGANIC CHEMISTRY
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3429793
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Patent number 3,429,793
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Issue date Feb 25, 1969
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C01 - INORGANIC CHEMISTRY
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2689217
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Patent number 2,689,217
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Issue date Sep 14, 1954
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C01 - INORGANIC CHEMISTRY