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发明名称
Improvements in or relating to telephone systems
摘要
申请公布号
GB804042(A)
申请公布日期
1958.11.05
申请号
GB19580003311
申请日期
1955.06.07
申请人
BRITISH TELECOMMUNICATIONS RESEARCH LIMITED
发明人
BAKER GEORGE THOMAS;SMITH JOHN LAWLEY
分类号
H04M3/523;H04M15/04;H04Q3/42
主分类号
H04M3/523
代理机构
代理人
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