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公开(公告)号：US3198886A
公开(公告)日：1965-08-03
申请号：US6671860
申请日：1960-11-02
Applicant: ERICSSON TELEFON AB L M
Inventor： OLOFSSON BAUMBACH THORKILD
CPC classification number: H04Q1/453 , H04Q3/0016
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