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公开(公告)号：US2939988A
公开(公告)日：1960-06-07
申请号：US69966357
申请日：1957-11-29
Applicant: EITEL MCCULLOUGH INC
Inventor： CULBERTSON ROBERT D , KENDALL JR JACKSON W , WESENBERG CORBIT M , WILLIAMS PAUL D
CPC classification number: H01J21/065 , H01J1/20 , H01J19/34 , H01J2893/0003
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