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经营范围
发明名称
SPEAKER DEVICE HAVING DIRECTIVITY
摘要
申请公布号
JPH02239796(A)
申请公布日期
1990.09.21
申请号
JP19890059682
申请日期
1989.03.14
申请人
PIONEER ELECTRON CORP;NIPPON TELEGR & TELEPH CORP <NTT>
发明人
OYABA TAKASHI;MORIKAWA HIDEAKI;KARI YASUO;INMAKI NAOFUMI
分类号
H04R1/02;H04R1/34
主分类号
H04R1/02
代理机构
代理人
主权项
地址
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