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公开(公告)号：US2663782A
公开(公告)日：1953-12-22
申请号：US18447650
申请日：1950-09-12
Applicant: BELL TELEPHONE LABOR INC
Inventor： NORMAN INSLEY , TANNER THEODORE L
IPC: H01C7/06
CPC classification number: H01C7/06
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