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公开(公告)号：US1816601A
公开(公告)日：1931-07-28
申请号：US9765226
申请日：1926-03-26
Applicant: BELL TELEPHONE LABOR INC
Inventor： MCNEILL GEORGE A
IPC: H01J19/34
CPC classification number: H01J19/34 , H01J2893/0003
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