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公开(公告)号：US3548110A
公开(公告)日：1970-12-15
申请号：US3548110D
申请日：1967-05-19
Applicant: ERICSSON TELEFON AB L M
Inventor： LUNDKVIST KARL AXEL
IPC: H04Q3/00
CPC classification number: H04Q3/0004
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