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发明名称
Loud-speaker
摘要
申请公布号
US1763049(A)
申请公布日期
1930.06.10
申请号
US19260087491
申请日期
1926.02.11
申请人
HOPKINS CORPORATION
发明人
HOPKINS MARCUS C.
分类号
H04R7/12
主分类号
H04R7/12
代理机构
代理人
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地址
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