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发明名称
Directional characteristics of electroacoustic transducers and method for utilizing the same
摘要
申请公布号
US2830283(A)
申请公布日期
1958.04.08
申请号
US19500156668
申请日期
1950.04.18
申请人
FRANK MASSA
发明人
MASSA FRANK
分类号
G01S1/72;G10K11/28
主分类号
G01S1/72
代理机构
代理人
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地址
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