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公开(公告)号：US2394008A
公开(公告)日：1946-02-05
申请号：US38760241
申请日：1941-04-09
Applicant: BELL TELEPHONE LABOR INC
Inventor： PIERCE JOHN R
IPC: H01J25/16
CPC classification number: H01J25/16
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公开(公告)号：US2207356A
公开(公告)日：1940-07-09
申请号：US20592838
申请日：1938-05-04
Applicant: BELL TELEPHONE LABOR INC
Inventor： PIERCE JOHN R
IPC: H01J25/76
CPC classification number: H01J25/76
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