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公开(公告)号：US1435731A
公开(公告)日：1922-11-14
申请号：US58772522
申请日：1922-09-12
Applicant: VERONA TOOL WORKS
Inventor： PETERS FRED W
IPC: E01B13/02
CPC classification number: E01B13/02 , E01B2201/02
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