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公开(公告)号：US2828217A
公开(公告)日：1958-03-25
申请号：US50495655
申请日：1955-04-29
Applicant: RAULAND CORP
Inventor： LEVIN NATHAN D , KINSCH FRANK J
IPC: H01J9/22
CPC classification number: H01J9/223
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