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Return to Abstracts of Patents Return to Abstracts of Patents 1250-1499 Patent Abstracts1280. ------. [I. G. FARBENINDUSTRIE A. G.] [Hydrocarbons and Oxygen Derivatives.] French Patent 815,716, July 21, 1937. Chem. Abs., vol. 32, 1938, p. 1712. See British Patent 469,959 (abs. 1281). |