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公开(公告)号：US2431097A
公开(公告)日：1947-11-18
申请号：US55321244
申请日：1944-09-08
Applicant: PHILIPS LAB INC
Inventor： GESSEL KAREL VAN
IPC: H01J19/36
CPC classification number: H01J19/36 , H01J2893/0027
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