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公开(公告)号：US3377434A
公开(公告)日：1968-04-09
申请号：US40253164
申请日：1964-10-08
Applicant: BELL TELEPHONE LABOR INC
Inventor： BANKS HARRY R , SORENSON GERALD R , WALSH HENRY J , WALSH JOHN G
IPC: H04Q3/00
CPC classification number: H04Q3/0004
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