Henkel and Cie.
Patent: DE672434 , 1932 ;
Fortschr. Teerfarbenfabr. Verw. Industriezweige, vol. 25, p. 889
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Henkel and Cie.
Patent: CH168343 , 1932 ;
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Henkel and Cie.
Patent: DE620889 , 1932 ;
Fortschr. Teerfarbenfabr. Verw. Industriezweige, vol. 21, p. 1302
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Henkel and Cie.
Patent: US1987526 , 1933 ;