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经营范围
发明名称
Improvements in or relating to automatic or semi-automatic telephone exchange systems
摘要
申请公布号
GB346370(A)
申请公布日期
1931.04.07
申请号
GB19310002893
申请日期
1930.01.07
申请人
STANDARD TELEPHONES AND CABLES, LIMITED;ESMOND PHILIP GOODWIN WRIGHT;GEORGE CLIFFORD HARTLEY
发明人
分类号
H04M7/10;H04Q3/00
主分类号
H04M7/10
代理机构
代理人
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