Merck and Co. Inc.
Patent: US2385224 , 1939 ;

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Takahashi; Nishigaki
Yakugaku Zasshi, 1949 , vol. 69, p. 416
Chem.Abstr., 1950 , p. 1923
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Merck and Co. Inc.
Patent: US2433388 , 1939 ;

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May and Baker Ltd.
Patent: US2362078 , 1939 ;

Merck and Co. Inc.
Patent: US2385224 , 1939 ;

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Merck and Co. Inc.
Patent: US2433388 , 1939 ;

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May and Baker Ltd.
Patent: US2362078 , 1939 ;

Merck and Co. Inc.
Patent: US2385224 , 1939 ;

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Merck and Co. Inc.
Patent: US2433388 , 1939 ;

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May and Baker Ltd.
Patent: US2362078 , 1939 ;

Foeldi et al.
Patent: US2332906 , 1940 ;

Foeldi et al.
Patent: US2332906 , 1940 ;

Foeldi et al.
Patent: US2332906 , 1940 ;