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公开(公告)号：US3084986A
公开(公告)日：1963-04-09
申请号：US80133559
申请日：1959-03-23
Applicant: ERICSSON TELEFON AB L M
Inventor： WALTER SCHONECK
IPC: G07C3/00
CPC classification number: G07C3/00 , Y10T409/300896
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