参考文献
Shell Devel.Co.
Patent: US2107515 , 1933 ;
Full Text Show Details
Shell Devel.Co.
Patent: US2148288 , 1936 ;
Full Text Show Details
N.V.de Bataafsche Petr.Mij.
Patent: DE640556 , 1932 ;
Fortschr. Teerfarbenfabr. Verw. Industriezweige, vol. 22, p. 60
Full Text Show Details
N.V.de Bataafsche Petr.Mij.
Patent: DE681268 , 1938 ;