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公开(公告)号：US2399758A
公开(公告)日：1946-05-07
申请号：US54971444
申请日：1944-08-16
Applicant: EITEL MCCULLOUGH INC
Inventor： NICOLA PIERRI LOUIS
IPC: H01J19/28
CPC classification number: H01J19/28 , H01J2893/0013
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