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经营范围
发明名称
ECHO SUPPRESSOR
摘要
申请公布号
JPH02230824(A)
申请公布日期
1990.09.13
申请号
JP19890049951
申请日期
1989.03.03
申请人
NEC CORP
发明人
SATO MASAYOSHI
分类号
H04B3/23
主分类号
H04B3/23
代理机构
代理人
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