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公开(公告)号：US2791718A
公开(公告)日：1957-05-07
申请号：US57991256
申请日：1956-04-23
Applicant: BELL TELEPHONE LABOR INC
Inventor： GLASS MYRON S
IPC: H01J3/02 , H01J23/08 , H01J23/087 , H01J25/34
CPC classification number: H01J25/34 , H01J3/029 , H01J23/08 , H01J23/087
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