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公开(公告)号：US2431139A
公开(公告)日：1947-11-18
申请号：US49187643
申请日：1943-06-23
Applicant: WESTINGHOUSE ELECTRIC CORP
Inventor： RETHERFORD ROBERT C , RAST WILLIAM L
IPC: H01J23/05
CPC classification number: H01J23/05
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