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公开(公告)号：US2332645A
公开(公告)日：1943-10-26
申请号：US41616441
申请日：1941-10-23
Applicant: BELL TELEPHONE LABOR INC
Inventor： KEITHLEY JOSEPH F , KNANDEL GEORGE J
IPC: H04L12/40
CPC classification number: H04L12/40
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