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公开(公告)号：US3070721A
公开(公告)日：1962-12-25
申请号：US84726059
申请日：1959-10-19
Applicant: EITEL MCCULLOUGH INC
Inventor： FERRY WILBUR V , HELLEY RICHARD M , TAYLOR ORMSBY P
IPC: H01J19/30
CPC classification number: H01J19/30 , H01J2893/0019
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