2266.     MICHAELIS, P.  [Development of Coal Processing.  I.  Coal as a Source of Solid Products.]  Oel u. Kohle, vol. 37, 1941, pp. 701-705; Chem. Zentralb., 1942, I, p. 137; Chem. Abs., vol. 37, 1943, p. 5845.

        Review of the processing of coal; the use of coke for the manufacture of carbides and C2H2, and the chemical products derived from it; low-temperature carbonization of coal; the preparation of briquets and cleaned coal and the uses of the latter; and the classification, properties, and uses of coal according to age and seam.