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发明名称
Telephone signaling system
摘要
申请公布号
US1754239(A)
申请公布日期
1930.04.15
申请号
US19280307831
申请日期
1928.09.24
申请人
AMERICAN TELEPHONE AND TELEGRAPH COMPANY
发明人
NILES ELIOT W.;EDWARDS WILLIAM H.
分类号
H01H47/22
主分类号
H01H47/22
代理机构
代理人
主权项
地址
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