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公开(公告)号：US2771556A
公开(公告)日：1956-11-20
申请号：US40152853
申请日：1953-12-31
Applicant: BELL TELEPHONE LABOR INC
Inventor： ANDERSON WILLIAM A , HARRISON CHARLES W
IPC: H03K4/43
CPC classification number: H03K4/43
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