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经营范围
发明名称
Bone audition apparatus
摘要
申请公布号
US2148024(A)
申请公布日期
1939.02.21
申请号
US19330678130
申请日期
1933.06.29
申请人
DICTOGRAPH PRODUCTS COMPANY, INC.
发明人
KOCH HENRY
分类号
H04R11/00
主分类号
H04R11/00
代理机构
代理人
主权项
地址
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