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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
GB406270(A)
申请公布日期
1934.02.20
申请号
GB19320023394
申请日期
1932.08.20
申请人
AUTOMATIC ELECTRIC COMPANY LIMITED;FRANCIS TATLOCK BELAS;GEORGE THOMAS BAKER
发明人
分类号
H04Q3/42
主分类号
H04Q3/42
代理机构
代理人
主权项
地址
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