1996. LAPPE, F., PIER, M., RUMPF, W., AND STERN, G. (I. G. Farbenindustrie A.-G). [Oxygenated Organic Compounds From Carbon Monoxide and Hydrogen.] German Patent 580,695, July 14, 1933. Chem. Abs., vol. 28, 1934, p. 171.

Parts of the apparatus that come into contact with CO are made of or lined with steel containing a substantial proportion of Mn. Addition to German Patents 559,892 (abs. 1377) and 490,248 (abs. 2679).