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发明名称
Directional sound apparatus
摘要
申请公布号
US2982941(A)
申请公布日期
1961.05.02
申请号
US19500174276
申请日期
1950.07.17
申请人
CHUN MELVIN E
发明人
CHUN MELVIN E.
分类号
G01S3/805
主分类号
G01S3/805
代理机构
代理人
主权项
地址
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