CIBA-Geigy
Patent: BE840884 , 1976 ;
Chem.Abstr., 1977 , vol. 87, # 34408
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Ciba-Geigy AG, Basel (Schweiz)
Patent: DE2616756 , 1976 ;
Chem.Abstr., 1977 , vol. 86, # 72011