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公开(公告)号：US1411390A
公开(公告)日：1922-04-04
申请号：US20031617
申请日：1917-11-05
Applicant: SECURITY TRUST COMPANY
Inventor： MILTON TIBBETTS
IPC: B23F21/22
CPC classification number: B23F21/226 , Y10T407/171 , Y10T407/1944
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