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公开(公告)号：US3004107A
公开(公告)日：1961-10-10
申请号：US57436056
申请日：1956-03-27
Applicant: SIEMENS AG
Inventor： RICHARD GROTE , EUGEN JAUCH , HERBERT TOPFER , WALTER VOITHENLEITNER
IPC: H04Q3/58
CPC classification number: H04Q3/58
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