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公开(公告)号：US2686902A
公开(公告)日：1954-08-17
申请号：US17553050
申请日：1950-07-24
Applicant: BELL TELEPHONE LABOR INC
Inventor： TILLOTSON LE ROY C
IPC: H01P1/213
CPC classification number: H01P1/2138
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