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公开(公告)号：US2318662A
公开(公告)日：1943-05-11
申请号：US41110041
申请日：1941-09-17
Applicant: BELL TELEPHONE LABOR INC
Inventor： BIDWELL CHARLES H , KOOS PAUL V
IPC: H03F1/54
CPC classification number: H03F1/54
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