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发明名称
Improvements relating to telephone systems
摘要
申请公布号
GB352529(A)
申请公布日期
1931.07.08
申请号
GB19300011152
申请日期
1930.04.08
申请人
SIEMENS BROTHERS & CO., LIMITED;DAVID ADAM CHRISTIAN;DOUGLAS PERCY LONG
发明人
分类号
H04M5/08
主分类号
H04M5/08
代理机构
代理人
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