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公开(公告)号：US2094060A
公开(公告)日：1937-09-28
申请号：US8624236
申请日：1936-06-20
Applicant: BELL TELEPHONE LABOR INC
Inventor： BUSCH ALOYSIUS J
IPC: H04M3/12
CPC classification number: H04M3/12
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公开(公告)号：US1823679A
公开(公告)日：1931-09-15
申请号：US47144730
申请日：1930-07-29
Applicant: BELL TELEPHONE LABOR INC
Inventor： BUSCH ALOYSIUS J
IPC: H04M17/02
CPC classification number: H04M17/023
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