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公开(公告)号：US1757708A
公开(公告)日：1930-05-06
申请号：US28320628
申请日：1928-06-06
Applicant: BELL TELEPHONE LABOR INC
Inventor： EVERETT SAMUEL H
IPC: H04M5/08
CPC classification number: H04M5/08
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公开(公告)号：US1804169A
公开(公告)日：1931-05-05
申请号：US32078428
申请日：1928-11-21
Applicant: BELL TELEPHONE LABOR INC
Inventor： KNOWLTON ALFRED D , EVERETT SAMUEL H
IPC: H04M17/02
CPC classification number: H04M17/023
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