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Return to Abstracts of Patents Return to Abstracts of Patents 1250-1499 Patent Abstracts1331. ------. [I. G. FARBENINDUSTRIE, A. G.] Lubricating Oils. British Patent 485,478, May 20, 1938. Chem. Abs., vol. 32, 1938, p. 8129. See French Patent 825,839 (abs. 1333). |