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经营范围
发明名称
Speaker
摘要
申请公布号
US2180615(A)
申请公布日期
1939.11.21
申请号
US19370141217
申请日期
1937.05.07
申请人
SERGE IGOR B
发明人
SERGE IGOR B.
分类号
H04R9/02
主分类号
H04R9/02
代理机构
代理人
主权项
地址
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