Celanese Corp.Am.
Patent: US2359391 , 1940 ;

I.G.Farbenind.
Patent: DE634035 , 1935 ;
Fortschr. Teerfarbenfabr. Verw. Industriezweige, vol. 23, p. 267
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Gen.Aniline Works
Patent: US2062458 , 1935 ;