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公开(公告)号:US2110433A
公开(公告)日:1938-03-08
申请号:US11946337
申请日:1937-01-07
Applicant: BELL TELEPHONE LABOR INC
Inventor: YOST LLOYD A
IPC: H04M1/15
CPC classification number: H04M1/15
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公开(公告)号:US2246576A
公开(公告)日:1941-06-24
申请号:US30606239
申请日:1939-11-25
Applicant: BELL TELEPHONE LABOR INC
Inventor: DARROW WIRT E , PETERSON GEORGE H , YOST LLOYD A
IPC: H04M19/02
CPC classification number: H04M19/02
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