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公开(公告)号：US2857542A
公开(公告)日：1958-10-21
申请号：US36541953
申请日：1953-07-01
Applicant: CURTIS CHARLES E
Inventor： CURTIS CHARLES E
IPC: H01J17/10
CPC classification number: H01J17/10
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公开(公告)号：US2538054A
公开(公告)日：1951-01-16
申请号：US11510249
申请日：1949-09-10
Applicant: ELECTRONS INC
Inventor： SMITH EARL K
IPC: H01J17/10
CPC classification number: H01J17/10
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