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Return to Abstracts of Patents Return to Abstracts of Patents 1000-1249 Patent Abstracts1234. ------. [I. G. FARBENINDUSTRIE A. G.] Ethylene. British Patent 506,832, June 6, 1939. Chem. Abs., vol. 34, 1940, p. 452. See United States Patent 2,154,676 (abs. 944). |