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公开(公告)号：US2584994A
公开(公告)日：1952-02-12
申请号：US76698047
申请日：1947-08-07
Applicant: INT STANDARD ELECTRIC CORP
Inventor： EDWARD EVERETT KENNETH
IPC: H01J19/30
CPC classification number: H01J19/30 , H01J2893/002 , Y10S428/925 , Y10S428/934 , Y10S428/937 , Y10T428/12625 , Y10T428/12806
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