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公开(公告)号：US2580097A
公开(公告)日：1951-12-25
申请号：US13353849
申请日：1949-12-17
Applicant: BELL TELEPHONE LABOR INC
Inventor： HGENFRITZ LESTER M , KETCHLEDGE RAYMOND W
IPC: H04B17/40
CPC classification number: H04B17/403
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