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公开(公告)号：US2499475A
公开(公告)日：1950-03-07
申请号：US74160447
申请日：1947-04-15
Applicant: ERICSSON TELEFON AB L M
Inventor： ARVID ERICSSON ERIK , CHRISTIAN JACOBAEUS ANTON
CPC classification number: H04M15/08 , H04M11/022
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