Gen. Aniline Corp.
Patent: US2292021 , 1933 ;

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I.G. Farbenind.
Patent: CH173286 , 1933 ;

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I.G. Farbenind.
Patent: DE710748 , 1932 ;
Fortschr. Teerfarbenfabr. Verw. Industriezweige, vol. 25, p. 607