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公开(公告)号：US2822432A
公开(公告)日：1958-02-04
申请号：US26411451
申请日：1951-12-29
Applicant: ERICSSON TELEFON AB L M
Inventor： HUGO BLOMBERG KNUT , EDWARD LINDSTROM HELGE , GOSTA THAMES HANS
CPC classification number: H04M1/17 , H04M1/02 , H04M1/0202 , H04M1/03
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