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经营范围
发明名称
BUSY TONE DETECTION SYSTEM
摘要
申请公布号
JPH0568272(A)
申请公布日期
1993.03.19
申请号
JP19910227663
申请日期
1991.09.09
申请人
NEC CORP
发明人
KOYAMA KAZUHIKO
分类号
H04B3/23;H04Q3/42
主分类号
H04B3/23
代理机构
代理人
主权项
地址
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