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公开(公告)号：US2939032A
公开(公告)日：1960-05-31
申请号：US63500457
申请日：1957-01-18
Applicant: EITEL MCCULLOUGH INC
Inventor： JEPSON STANLEY R
IPC: H01J19/34
CPC classification number: H01J19/34 , H01J2893/0003
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