1926. ------. [KOPPERS, H., G. m. b. H.] [Generating Carbon Monoxide and Hydrogen in a Volume Ratio of 1:2 From Brown-Coal Briquets or Similar Bituminous Fuel.] German Patent 716,078, Dec. 11, 1941; appl. K 138,425 filed June, 1935 (Cl. 26 a-2). Chem. Abs., vol. 38, 1944, p. 2192.

See United States Patent 2,151,121 (abs. 1922).