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经营范围
发明名称
Sound projecting apparatus
摘要
申请公布号
US1875171(A)
申请公布日期
1932.08.30
申请号
US19290385917
申请日期
1929.08.14
申请人
SPRAGUE LE ROY A;DORSCH CHARLES F
发明人
SPRAGUE LE ROY A.;DORSCH CHARLES F.
分类号
H04R1/28
主分类号
H04R1/28
代理机构
代理人
主权项
地址
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