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公开(公告)号：US2572611A
公开(公告)日：1951-10-23
申请号：US77091847
申请日：1947-08-27
Applicant: BELL TELEPHONE LABOR INC
Inventor： GLORE ROBERT F , SCHUNKE KARL H
IPC: B23D21/14
CPC classification number: B23D21/145
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