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公开(公告)号：US2921636A
公开(公告)日：1960-01-19
申请号：US64178756
申请日：1956-10-29
Applicant: HELMUT ANDRES , VON HAYN ERNST , EDUARD ROEMERT
Inventor： HELMUT ANDRES , VON HAYN ERNST , EDUARD ROEMERT
IPC: E01B27/10
CPC classification number: E01B27/10
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