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发明名称
Improvements in or relating to telephone systems
摘要
申请公布号
GB334578(A)
申请公布日期
1930.09.05
申请号
GB19290017254
申请日期
1929.06.05
申请人
STANDARD TELEPHONES AND CABLES, LIMITED;ESMOND PHILIP GOODWIN WRIGHT
发明人
分类号
H04Q3/00
主分类号
H04Q3/00
代理机构
代理人
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