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公开(公告)号：US2948780A
公开(公告)日：1960-08-09
申请号：US62090856
申请日：1956-11-07
Applicant: ERICSSON TELEFON AB L M
Inventor： KARLBY BERGMANN ANDERS , JAN BRYNILDSEN , GEORG BORGSTROM JOHAN CLAES , BERNHARD GOOS JACQUES
IPC: H04Q3/00
CPC classification number: H04Q3/0004
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