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1983-12-16
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1977-08-03
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1969-06-11
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1900-01-01
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1956-12-11
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1983-06-21
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1946-01-29
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1973-10-24
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1957-04-23
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1966-03-23
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1921-01-04
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1937-07-06
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1961-09-12
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1941-11-25
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1941-04-22
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1992-08-05
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1981-11-18
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1937-03-09
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1939-06-13
Metallurgical process
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1943-11-16
Manufacture of metallic magnesium
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1941-11-25
Process for obtaining chromium oxide
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1888-05-22
westman
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2010-06-27
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1936-08-25
Method of condensing magnesium