Searle and Co.
Patent: US2591679 , 1948 ;

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Searle and Co.
Patent: US2694705 , 1951 ;

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Dahlbom; Ekstrand
Acta Chemica Scandinavica (1947-1973), 1951 , vol. 5, p. 102,104
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Searle and Co.
Patent: US2694706 , 1952 ;