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公开(公告)号：US1881642A
公开(公告)日：1932-10-11
申请号：US55101431
申请日：1931-07-15
Applicant: BELL TELEPHONE LABOR INC
Inventor： JONES HERBERT L , VEAZIE EDMUND A
IPC: H04B3/06
CPC classification number: H04B3/06
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