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经营范围
发明名称
Acoustical device
摘要
申请公布号
US1981962(A)
申请公布日期
1934.11.27
申请号
US19330678115
申请日期
1933.06.29
申请人
MARRIOTT ROBERT H
发明人
MARRIOTT ROBERT H.
分类号
G10K11/08
主分类号
G10K11/08
代理机构
代理人
主权项
地址
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