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公开(公告)号：US2880349A
公开(公告)日：1959-03-31
申请号：US43741654
申请日：1954-06-17
Applicant: EITELMCCULLOUGH INC
Inventor： POLESE JAMES P
IPC: H01J19/34
CPC classification number: H01J19/34 , H01J2893/0003
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