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公开(公告)号：US1696271A
公开(公告)日：1928-12-25
申请号：US22871527
申请日：1927-10-26
Applicant: BELL TELEPHONE LABOR INC
Inventor： HAGUE ALFRED E
IPC: H04Q3/42
CPC classification number: H04Q3/42
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公开(公告)号：US1675886A
公开(公告)日：1928-07-03
申请号：US15976027
申请日：1927-01-08
Applicant: BELL TELEPHONE LABOR INC
Inventor： HAGUE ALFRED E
IPC: H04Q3/00
CPC classification number: H04Q3/00
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