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公开(公告)号：US2429836A
公开(公告)日：1947-10-28
申请号：US53266644
申请日：1944-04-25
Applicant: MCFARLANE JR JAMES ALBERT
Inventor： MCFARLANE JR JAMES ALBERT
IPC: H01J9/50
CPC classification number: H01J9/50 , H01J2893/0072 , Y02W30/828
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