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Return to Abstracts of Patents Return to Abstracts of Patents 1250-1499 Patent Abstracts1268. ------. [I. G. FARBENINDUSTRIE A. G.] [Hydrocarbons]. French Patent 648,946, Feb. 14, 1928. Chem. Abs., vol. 23, 1929, p. 2722. See British Patent 293,572 (abs. 1257). |