1668. ------. [INTERNATIONAL HYDROCARBON SYNTHESIS CO.] [Hydrocarbon Synthesis.] Swiss Patent 211,489, no date. Schmidt, J., Das Kohlenoxyd, Akad. Verlagsgesell., Leipzig, 1950, p. 176.

See British Patent 518,372 (abs. 1295) and French Patent 855,136 (abs. 1710).