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公开(公告)号：US1829913A
公开(公告)日：1931-11-03
申请号：US50550430
申请日：1930-12-30
Applicant: WOODINGSVERONA TOOL WORKS
Inventor： SKOWRON EDMUND A
IPC: E01B13/02
CPC classification number: E01B13/02 , E01B2201/08
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