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公开(公告)号：US2120973A
公开(公告)日：1938-06-21
申请号：US6822836
申请日：1936-03-11
Applicant: BELL TELEPHONE LABOR INC
Inventor： EGINHARD DIETZE , FOLEY JOHN W
IPC: H04M1/02
CPC classification number: H04M1/02
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