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发明名称
Improvements relating to telephone instruments
摘要
申请公布号
GB567026(A)
申请公布日期
1945.01.24
申请号
GB19430013522
申请日期
1943.08.19
申请人
SIEMENS BROTHERS & CO. LIMITED;GEORGE WILLIAM SUTTON
发明人
分类号
H04M1/03
主分类号
H04M1/03
代理机构
代理人
主权项
地址
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