1883.  KLEIN, O. (Ruhrchemie A.-G.). [Compositions for Desulfurizing Gases.] German Patent 664,055, Aug. 19, 1938 (Cl. 26d-8.04). Chem. Abs., vol. 33, 1939, p. 838.

Describes apparatus for producing the compounds described in German Patent 659,407 (abs. 2805).