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经营范围
发明名称
Acoustic device
摘要
申请公布号
US1893143(A)
申请公布日期
1933.01.03
申请号
US19310566678
申请日期
1931.10.03
申请人
DICTOGRAPH PRODUCTS CO., INC.
发明人
KOCH HENRY
分类号
H04R25/02
主分类号
H04R25/02
代理机构
代理人
主权项
地址
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