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1.发明授权
公开(公告)号：US3365574A
公开(公告)日：1968-01-23
申请号：US42922765
申请日：1965-02-01
Applicant: TI GROUP SERVICES LTD
Inventor： PETER DUNCUMB
IPC: H01J37/252
CPC classification number: H01J37/252
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公开(公告)号：US3260845A
公开(公告)日：1966-07-12
申请号：US20871762
申请日：1962-07-10
Applicant: TI GROUP SERVICES LTD
Inventor： PETER DUNCUMB
IPC: G01N23/225
CPC classification number: G01N23/225
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