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公开(公告)号：US2567415A
公开(公告)日：1951-09-11
申请号：US5202048
申请日：1948-09-30
Applicant: BELL TELEPHONE LABOR INC
Inventor： WALSH EDWARD J
IPC: H01J19/00
CPC classification number: H01J19/00 , H01J2893/0024
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公开(公告)号：US2549551A
公开(公告)日：1951-04-17
申请号：US243348
申请日：1948-01-15
Applicant: BELL TELEPHONE LABOR INC
Inventor： WALSH EDWARD J
IPC: H01J19/00
CPC classification number: H01J19/00 , H01J2893/0024
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公开(公告)号：US2509947A
公开(公告)日：1950-05-30
申请号：US1610748
申请日：1948-03-20
Applicant: BELL TELEPHONE LABOR INC
Inventor： WALSH EDWARD J
IPC: H01J21/20
CPC classification number: H01J21/20 , H01J2893/003
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