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公开(公告)号：US2941043A
公开(公告)日：1960-06-14
申请号：US67797657
申请日：1957-08-13
Applicant: BELL TELEPHONE LABOR INC
Inventor： HAM JR JAMES H , HERSHEY HAROLD J , HOHMANN JR LAWRENCE A , KINSMAN FRANK W
IPC: H04M1/276
CPC classification number: H04M1/276
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