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公开(公告)号：US2909690A
公开(公告)日：1959-10-20
申请号：US69181957
申请日：1957-10-23
Applicant: EITEL MCCULLOUGH INC
Inventor： LEVIN MARTIN E , WOLFSON ANTHONY S , YOUNG JAMES I
IPC: H01J31/04
CPC classification number: H01J31/04
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