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发明名称
Sound device
摘要
申请公布号
US1809916(A)
申请公布日期
1931.06.16
申请号
US19290415903
申请日期
1929.12.23
申请人
STAGGS JESSE D
发明人
STAGGS JESSE D.
分类号
H04R7/16
主分类号
H04R7/16
代理机构
代理人
主权项
地址
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