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3914397
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Patent number 3,914,397
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Issue date Oct 21, 1975
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C01 - INORGANIC CHEMISTRY
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2240344
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Patent number 2,240,344
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Issue date Apr 29, 1941
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C01 - INORGANIC CHEMISTRY
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2157525
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Patent number 2,157,525
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Issue date May 9, 1939
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C01 - INORGANIC CHEMISTRY
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2157524
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Patent number 2,157,524
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Issue date May 9, 1939
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C01 - INORGANIC CHEMISTRY
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2155281
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Patent number 2,155,281
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Issue date Apr 18, 1939
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C01 - INORGANIC CHEMISTRY