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公开(公告)号：US2594505A
公开(公告)日：1952-04-29
申请号：US13211249
申请日：1949-12-09
Applicant: BELL TELEPHONE LABOR INC
Inventor： SEUDDER FREDERICK J , EDWARD VROOM
IPC: H04M15/08
CPC classification number: H04M15/08
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