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公开(公告)号：US3080457A
公开(公告)日：1963-03-05
申请号：US83698959
申请日：1959-08-31
Applicant: ERICSSON TELEFON AB L M
Inventor： AXEL JANSSON TAGE , STURE EKWALL SVEN
IPC: H04M1/23
CPC classification number: H04M1/23
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