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公开(公告)号：US2909738A
公开(公告)日：1959-10-20
申请号：US37455453
申请日：1953-08-17
Applicant: BELL TELEPHONE LABOR INC
Inventor： DAVIS JAMES L , ROWEN JOHN H
IPC: H01P1/375
CPC classification number: H01P1/375
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