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I. G. Farbenindustrie A.-G. Patent: FR713452 , 1931 ; C. I, 1932 , p. 450 Full Text Show Details Gmelin Handbook: Na: SVol.4, 7, page 1382 - 1384 Full Text Show Details I. G. Farbenindustrie A.-G. Patent: GB354604 , 1930 ; C. A., 1932 , p. 3881