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公开(公告)号：US2656476A
公开(公告)日：1953-10-20
申请号：US14174350
申请日：1950-02-01
Applicant: FIRMINHAC RALPH H
Inventor： FIRMINHAC RALPH H
IPC: H01J47/06
CPC classification number: H01J47/06
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公开(公告)号：US2505919A
公开(公告)日：1950-05-02
申请号：US71952646
申请日：1946-12-31
Applicant: ATOMIC ENERGY COMMISSION
Inventor： SIMPSON JR JOHN A
IPC: H01J47/06
CPC classification number: H01J47/06
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