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公开(公告)号：US2431740A
公开(公告)日：1947-12-02
申请号：US57411845
申请日：1945-01-23
Applicant: EITEL MCCULLOUGH INC
Inventor： EITEL WILLIAM W , MCCULLOUGH JACK A , GORDON HOWES
IPC: H01J21/06
CPC classification number: H01J21/065
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