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发明名称
Telephone systems
摘要
申请公布号
US2840641(A)
申请公布日期
1958.06.24
申请号
US19560564553
申请日期
1956.02.09
申请人
AUTOMATIC TELEPHONE & ELECTRIC COMPANY LIMITED
发明人
ALLUM ROBIN DEVENISH;HELSBY GORDON WILLIAM
分类号
H04Q3/54
主分类号
H04Q3/54
代理机构
代理人
主权项
地址
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