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公开(公告)号：US2596245A
公开(公告)日：1952-05-13
申请号：US6758448
申请日：1948-12-28
Applicant: ERICSSON TELEFON AB L M
Inventor： GEORG JOHNSON KARL , VALDEMAR HOFSTRAND NILS
IPC: H04Q3/00
CPC classification number: H04Q3/0016
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