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发明名称
ELECTROACOUSTIC TRANSDUCER
摘要
申请公布号
JPH01160299(A)
申请公布日期
1989.06.23
申请号
JP19870317503
申请日期
1987.12.17
申请人
NEC CORP
发明人
HAMA YOSHINORI
分类号
G01S7/521;G01S7/52;H04R1/34;H04R17/00
主分类号
G01S7/521
代理机构
代理人
主权项
地址
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