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公开(公告)号：US3105111A
公开(公告)日：1963-09-24
申请号：US46484842
申请日：1942-11-07
Applicant: BELL TELEPHONE LABOR INC
Inventor： FARNSWORTH DANIEL W , STEINBERG JOHN C
IPC: H04L25/05
CPC classification number: H04L25/05
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