• 参考文献

    Dow Chem. Co. Patent: US2606183 , 1949 ; Full Text Show Details Dow Chem. Co. Patent: US2576064 , 1949 ; Full Text Show Details Dow Chem. Co. Patent: US2576065 , 1951 ; Full Text Show Details Dow Chem. Co. Patent: US2705730 , 1949 ;

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