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公开(公告)号：US1580850A
公开(公告)日：1926-04-13
申请号：US4018525
申请日：1925-06-29
Applicant: BELL TELEPHONE LABOR INC
Inventor： OTIS RUSSELL M , FUNK WILBUR F
IPC: H01J19/34
CPC classification number: H01J19/34 , H01J2893/0003
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