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经营范围
发明名称
Improvements in or relating to sound reproducing or transmitting instruments
摘要
申请公布号
GB324493(A)
申请公布日期
1930.01.30
申请号
GB19280038509
申请日期
1928.12.31
申请人
SIDNEY GEORGE BROWN
发明人
分类号
H04R7/14
主分类号
H04R7/14
代理机构
代理人
主权项
地址
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