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发明名称
Protection signalling system having channel impedance alteration means for providing indications of remote station conditions
摘要
申请公布号
US3214734(A)
申请公布日期
1965.10.26
申请号
US19590821437
申请日期
1959.06.19
申请人
AMERICAN DISTRICT TELEGRAPH COMPANY
发明人
WHITEHEAD HARRY G.
分类号
G08B25/04;H04Q9/16
主分类号
G08B25/04
代理机构
代理人
主权项
地址
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