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公开(公告)号：US2299212A
公开(公告)日：1942-10-20
申请号：US40089241
申请日：1941-07-03
Applicant: BELL TELEPHONE LABOR INC
Inventor： COLLIS RAYMOND E , GETZ EMIL L , HERSEY RALPH E , KOPP OTTMAR H
IPC: H04Q3/00
CPC classification number: H04Q3/0004
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