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公开(公告)号：US3397338A
公开(公告)日：1968-08-13
申请号：US43517865
申请日：1965-02-25
Applicant: SIEMENS AG
Inventor： FRIEDRICH ELSAS ADOLF
CPC classification number: H01J35/10 , H01J19/30 , H01J2893/002
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