参考文献

Kalle and Co. Patent: DE248083 ; Fortschr. Teerfarbenfabr. Verw. Industriezweige, vol. 10, p. 540 Full Text Show Details Kalle and Co. Patent: DE236536 ; Fortschr. Teerfarbenfabr. Verw. Industriezweige, vol. 10, p. 538,539 Full Text Show Details Kalle and Co. Patent: DE243536 ; Full Text Show Details Kalle and Co. Patent: DE232714 ; Fortschr. Teerfarbenfabr. Verw. Industriezweige, vol. 10, p. 534,536 Full Text Show Details Kalle and Co. Patent: DE233473 ;