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公开(公告)号：US2258980A
公开(公告)日：1941-10-14
申请号：US33025440
申请日：1940-04-18
Applicant: BELL TELEPHONE LABOR INC
Inventor： EAGON LLOYD L , NEW YORK JAMES B MCKIM
IPC: H04M3/12
CPC classification number: H04M3/12
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