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公开(公告)号：US2507706A
公开(公告)日：1950-05-16
申请号：US282548
申请日：1948-01-17
Applicant: BELL TELEPHONE LABOR INC
Inventor： GEE RICHARD C , WARREN GRONROS
IPC: H01J21/06
CPC classification number: H01J21/065
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