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公开(公告)号：US2717190A
公开(公告)日：1955-09-06
申请号：US46202054
申请日：1954-10-13
Applicant: THOMAS A DEMETRY
Inventor： SHOUP CARL A
CPC classification number: H01J9/505 , H01J19/02 , H01J2893/0001 , Y02W30/828
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