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公开(公告)号：US2810693A
公开(公告)日：1957-10-22
申请号：US39912253
申请日：1953-12-18
Applicant: INFILCO INC
Inventor： WERNER WISFELD , ROLF-KARL DORN , ERICH HERRMANN
CPC classification number: B01J47/10
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