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公开(公告)号：US3117224A
公开(公告)日：1964-01-07
申请号：US12803261
申请日：1961-07-31
Applicant: VARIAN ASSOCIATES
Inventor： FRANCIS ARTHUR B , BARRINGTON ALFRED E , HELMER JOHN C
IPC: H01J49/32
CPC classification number: H01J49/32
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