参考文献

Henkel and Cie. Patent: FR748460 , 1933 ; Full Text Show Details Henkel and Cie. Patent: DE620889 , 1932 ; Fortschr. Teerfarbenfabr. Verw. Industriezweige, vol. 21, p. 1302 Full Text Show Details Henkel and Cie. Patent: US1987526 , 1933 ;