American Cyanamid Company
Patent: US3932479 A1, 1976 ;

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American Cyanamid Company
Patent: US3966773 A1, 1976 ;

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American Cyanamid Company
Patent: US4110368 A1, 1978 ;

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American Cyanamid Company
Patent: US4123456 A1, 1978 ;

G. D. Searle and Co.
Patent: US3932496 A1, 1976 ;