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1.发明授权Device for adjusting the refractive power of electron lenses operating with permanent magnet excitation 失效用于调整用永磁激励工作的电子透镜的屈光力的装置
公开(公告)号：US2804548A
公开(公告)日：1957-08-27
申请号：US26729452
申请日：1952-01-19
Applicant: SIEMENS AG
Inventor： ERNST RUSKA
IPC: H01J37/143
CPC classification number: H01J37/143 , H01J2893/0018
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公开(公告)号：US2633553A
公开(公告)日：1953-03-31
申请号：US20876651
申请日：1951-01-31
Applicant: SIEMENS AG
Inventor： ERNST RUSKA , EMIL HENTSCHEL
IPC: H01J29/62
CPC classification number: H01J29/624
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