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1.发明授权
公开(公告)号：US2663662A
公开(公告)日：1953-12-22
申请号：US23858851
申请日：1951-07-25
Applicant: BASF AG
Inventor： FRITZ GRAF , TIM TOEPEL
CPC classification number: E01B9/16 , F16B13/142 , F16B39/225 , Y10S411/929 , Y10S411/947 , Y10T29/49863 , Y10T29/49885 , Y10T29/49964 , Y10T29/4997
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