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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
GB332956(A)
申请公布日期
1930.08.01
申请号
GB19290013556
申请日期
1929.05.01
申请人
AUTOMATIC TELEPHONE MANUFACTURING COMPANY LIMITED;JOHN ELLIS OSTLINE;REGINALD TAYLOR;CHARLES EDMUND BEALE
发明人
分类号
H04Q3/42
主分类号
H04Q3/42
代理机构
代理人
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