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公开(公告)号：US3472968A
公开(公告)日：1969-10-14
申请号：US3472968D
申请日：1966-01-04
Applicant: ERICSSON TELEFON AB L M
Inventor： JACOBAEUS ANTON CHRISTIAN , LARSSON TORSTEN ALRIK
CPC classification number: H04Q3/42
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