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公开(公告)号：US3405029A
公开(公告)日：1968-10-08
申请号：US63990867
申请日：1967-05-19
Applicant: BELL TELEPHONE LABOR INC
Inventor： HANES MAURICE H , HELMKE GEORGE E
IPC: H03H9/125
CPC classification number: H03H9/125 , Y10T428/265 , Y10T428/31525 , Y10T428/31529
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