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公开(公告)号：US3396299A
公开(公告)日：1968-08-06
申请号：US45866465
申请日：1965-05-25
Applicant: JEOL LTD
Inventor： TAKASHI YANAKA
IPC: H01J29/64 , H01J37/09 , H01J37/14 , H01J37/141
CPC classification number: H01J37/09 , H01J29/64 , H01J37/14 , H01J37/141
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