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公开(公告)号：US2533484A
公开(公告)日：1950-12-12
申请号：US54284644
申请日：1944-06-30
Applicant: BELL TELEPHONE LABOR INC
Inventor： LUKAES JOSEPH J , STRICKLER WALTER B
IPC: G09B9/18
CPC classification number: G09B9/18
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