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公开(公告)号：US2875349A
公开(公告)日：1959-02-24
申请号：US48302455
申请日：1955-01-20
Applicant: WESTINGHOUSE ELECTRIC CORP
Inventor： ROBERTS WILLIAM L , COLTMAN JOHN W
IPC: H01J31/52
CPC classification number: H01J31/52
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