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公开(公告)号：US2041802A
公开(公告)日：1936-05-26
申请号：US67842633
申请日：1933-06-30
Applicant: BELL TELEPHONE LABOR INC
Inventor： WILSON JAMES R , ACKER JOHN T , HARTMAN CHARLES D
IPC: H01J9/04
CPC classification number: H01J9/047
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