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公开(公告)号：US1963755A
公开(公告)日：1934-06-19
申请号：US58108431
申请日：1931-12-15
Applicant: BELL TELEPHONE LABOR INC
Inventor： MEAD EDWARD D
IPC: H01C1/14
CPC classification number: H01C1/14
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公开(公告)号：US1743470A
公开(公告)日：1930-01-14
申请号：US22771027
申请日：1927-10-21
Applicant: BELL TELEPHONE LABOR INC
Inventor： MEAD EDWARD D
IPC: H04M15/10
CPC classification number: H04M15/10
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