Soc. Usines Chim. Rhone-Poulenc Patent: DE615471 , 1933 ; Fortschr. Teerfarbenfabr. Verw. Industriezweige, vol. 22, p. 713 Full Text Show Details Soc. Usines Chim. Rhone-Poulenc Patent: US2056046 , 1934 ;