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发明名称
Improvements relating to electromagnetic telephone instruments
摘要
申请公布号
GB547707(A)
申请公布日期
1942.09.08
申请号
GB19410002818
申请日期
1941.03.03
申请人
SIEMENS BROTHERS & CO. LIMITED;GEORGE WILLIAM SUTTON
发明人
分类号
H04R11/00
主分类号
H04R11/00
代理机构
代理人
主权项
地址
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