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发明名称
DIRECTIONAL ULTRASONIC LOUD-SPEAKER DEVICE
摘要
申请公布号
JPH11145915(A)
申请公布日期
1999.05.28
申请号
JP19970306234
申请日期
1997.11.07
申请人
NEC CORP
发明人
SUZUKI MITSUHARU
分类号
G01S7/524;H04B11/00;(IPC1-7):H04B11/00
主分类号
G01S7/524
代理机构
代理人
主权项
地址
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