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公开(公告)号:US2668927A
公开(公告)日:1954-02-09
申请号:US25736651
申请日:1951-11-20
Applicant: BELL TELEPHONE LABOR INC
Inventor: JONAS HERBERT C , SEARS RAYMOND W
IPC: H01J31/06
CPC classification number: H01J31/06
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公开(公告)号:US2459030A
公开(公告)日:1949-01-11
申请号:US58141045
申请日:1945-03-07
Applicant: BELL TELEPHONE LABOR INC
Inventor: JONAS HERBERT C , LAICO JOSEPH P , RONCI VICTOR L
IPC: H01J23/213
CPC classification number: H01J23/213
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