720. ---------------.[DOLCH, P.] [Development of the Koppers Continuous Vertical Retort in the Past 25 Years.] Gas- u. Wasserfach, vol. 86, 1943, pp. 27-33; British Chem. Abs., 1945, I, B, p. 118.

720. ---------------. [DOLCH, P.] [Development of the Koppers Continuous Vertical Retort in the Past 25 Years.] Gas- u. Wasserfach, vol. 86, 1943, pp. 27-33; British Chem. Abs., 1945, I, B, p. 118.

Kopper’s installation for producing synthesis gas for noncoking Japanese long-flame coal of low ash-melting point is described.