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公开(公告)号：US3184553A
公开(公告)日：1965-05-18
申请号：US86296359
申请日：1959-12-30
Applicant: ERICSSON TELEFON AB L M
Inventor： HAROLD BJORK JOHN CARL , ERIK BACKHOLM BENGT
IPC: H04M20060101 , H04Q3/00
CPC classification number: H04Q3/0004
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