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发明名称
Telephone-exchange system
摘要
申请公布号
US1742927(A)
申请公布日期
1930.01.07
申请号
US19270220211
申请日期
1927.09.17
申请人
BELL TELEPHONE LABORATORIES, INCORPORATED;AMERICAN TELEPHONE AND TELEGRAPH COMPANY
发明人
NICOLL ROBERT I.D.;DAVIS RICHARD C.;NOSTITZ ERICH VON
分类号
H04M5/04
主分类号
H04M5/04
代理机构
代理人
主权项
地址
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