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发明名称
Sound transmitting device
摘要
申请公布号
US1928309(A)
申请公布日期
1933.09.26
申请号
US19300491368
申请日期
1930.10.27
申请人
BURKE DAVID F
发明人
BURKE DAVID F.
分类号
H04R1/18
主分类号
H04R1/18
代理机构
代理人
主权项
地址
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