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公开(公告)号：US3408525A
公开(公告)日：1968-10-29
申请号：US45895165
申请日：1965-05-26
Applicant: SIEMENS AG
Inventor： ALEX BAHR
CPC classification number: H01T4/12 , H01H1/66 , H01J17/00 , H01J2893/0059
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