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经营范围
发明名称
Improvements in or relating to signalling in telephone systems
摘要
申请公布号
GB636669(A)
申请公布日期
1950.05.03
申请号
GB19460011520
申请日期
1946.04.15
申请人
STANDARD TELEPHONES AND CABLES LIMITED;ESMOND PHILIP GOODWIN WRIGHT;WILLIAM FREDERICK GOULD;THOMAS FREDERICK STANLEY HARGREAVES;WILLIAM JOHN REYNOLDS
发明人
分类号
H04M7/16
主分类号
H04M7/16
代理机构
代理人
主权项
地址
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