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公开(公告)号：US3520417A
公开(公告)日：1970-07-14
申请号：US3520417D
申请日：1969-07-02
Applicant: CARBORUNDUM CO
Inventor： DURR LARRY L , FULTON EDWARD D
CPC classification number: B01D29/111 , B01D29/21 , B01D2201/0407 , B01D2201/127
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