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3664809
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Patent number 3,664,809
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Issue date May 23, 1972
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C01 - INORGANIC CHEMISTRY
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3652208
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Patent number 3,652,208
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Issue date Mar 28, 1972
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C01 - INORGANIC CHEMISTRY
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2176444
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Patent number 2,176,444
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Issue date Oct 17, 1939
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C01 - INORGANIC CHEMISTRY
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2174684
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Patent number 2,174,684
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Issue date Oct 3, 1939
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C01 - INORGANIC CHEMISTRY
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818754
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Patent number 818,754
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Issue date Apr 24, 1906
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C01 - INORGANIC CHEMISTRY