Miles Labor. Inc.
Patent: US2971975 , 1955 ;

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Asta-Werke
Patent: GB732286 , 1952 ;

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Ciba Pharm. Prod. Inc.
Patent: US2234311 , 1939 ;

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Ciba
Patent: DE720468 , 1939 ;
DRP/DRBP Org.Chem.
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Ciba
Patent: CH219518 , 1938 ;