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发明名称
Improvements relating to telephone systems
摘要
申请公布号
GB439388(A)
申请公布日期
1935.12.05
申请号
GB19340032498
申请日期
1934.11.12
申请人
SIEMENS BROTHERS & CO. LIMITED;GEORGE WILLIAM SUTTON
发明人
分类号
H04M1/00;H04R21/02
主分类号
H04M1/00
代理机构
代理人
主权项
地址
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