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经营范围
发明名称
Improvements in or relating to telephone systems
摘要
申请公布号
GB331581(A)
申请公布日期
1930.07.07
申请号
GB19290010621
申请日期
1929.04.05
申请人
AUTOMATIC TELEPHONE MANUFACTURING COMPANY LIMITED;LANCELOT MARTIN SIMPSON
发明人
分类号
H04Q1/20
主分类号
H04Q1/20
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代理人
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