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公开(公告)号：US2027181A
公开(公告)日：1936-01-07
申请号：US75555534
申请日：1934-12-01
Applicant: BELL TELEPHONE LABOR INC
Inventor： LAICO JOSEPH P
CPC classification number: H01J9/32 , H01J5/24 , H01J2893/0039
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公开(公告)号：US2027180A
公开(公告)日：1936-01-07
申请号：US75344734
申请日：1934-11-17
Applicant: BELL TELEPHONE LABOR INC
Inventor： LAICO JOSEPH P
IPC: H01J21/06
CPC classification number: H01J21/065
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