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公开(公告)号：US2864487A
公开(公告)日：1958-12-16
申请号：US36322853
申请日：1953-06-22
Applicant: UNTERTAGE MASCHINENBAU GMBH
Inventor： WILHELM BECKER , GEORG KRULL , OSKAR NOE
CPC classification number: B65G2201/04
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