Parke, Davis and Co.
Patent: US2397424 , 1940 ;

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Parke, Davis and Co.
Patent: US2397426 , 1944 ;

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CIBA
Patent: US2323277 , 1941 ;

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CIBA
Patent: CH235279 , 1940 ;

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Parke, Davis and Co.
Patent: US2397425 , 1940 ;