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Return to Abstracts of Patents Return to Abstracts of Patents 250-499 Patent Abstracts498. ------. [DIRECTIE VAN DE STAATSMIJNEN IN LIMBURG.] Gasifying Carbonaceous Material. British Patent 690,214. Apr. 15, 1953. Chem. Abs., vol. 47, 1953, p. 7762. See Netherlands Patent 68,480 (abs. 499). |