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公开(公告)号：US2806960A
公开(公告)日：1957-09-17
申请号：US26166351
申请日：1951-12-14
Applicant: PATERSON HENDERSON RONALD
Inventor： PATERSON HENDERSON RONALD
IPC: H01J47/04
CPC classification number: H01J47/04
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公开(公告)号：US2742577A
公开(公告)日：1956-04-17
申请号：US26166451
申请日：1951-12-14
Applicant: PATERSON HENDERSON RONALD
Inventor： PATERSON HENDERSON RONALD
IPC: H01J47/04
CPC classification number: H01J47/04
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