参考文献

Henkel and Cie. Patent: US2028654 , 1933 ; Full Text Show Details Henkel and Cie. Patent: DE615171 , 1932 ; Fortschr. Teerfarbenfabr. Verw. Industriezweige, vol. 21, p. 1300 Full Text Show Details Henkel and Cie. Patent: FR751923 , 1933 ;