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发明名称
Acoustical device
摘要
申请公布号
US2364485(A)
申请公布日期
1944.12.05
申请号
US19390283631
申请日期
1939.07.10
申请人
SPENCER CHARLES B
发明人
SPENCER CHARLES B.
分类号
G10K9/13;G10K9/20
主分类号
G10K9/13
代理机构
代理人
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地址
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