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发明名称
Improvements relating to telephone systems
摘要
申请公布号
GB550344(A)
申请公布日期
1943.01.04
申请号
GB19410010110
申请日期
1941.08.08
申请人
SIEMENS BROTHERS & CO. LIMITED;DAVID LANGSFORD CLAY
发明人
分类号
H04Q1/36;H04Q1/446
主分类号
H04Q1/36
代理机构
代理人
主权项
地址
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