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公开(公告)号：US2779824A
公开(公告)日：1957-01-29
申请号：US37691653
申请日：1953-08-27
Applicant: ERICSSON TELEFON AB L M
Inventor： EMIL NILSSON NILS , OSKAR RODNERT GUSTAV , GUSTAF JONSSON PER
IPC: H04M15/08
CPC classification number: H04M15/08
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