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发明名称
CALLING PROGRESS TONE DETECTION CIRCUIT
摘要
申请公布号
JPH02234558(A)
申请公布日期
1990.09.17
申请号
JP19890053636
申请日期
1989.03.08
申请人
NEC CORP
发明人
MIZUKAMI TOSHIHIKO
分类号
H04M11/00
主分类号
H04M11/00
代理机构
代理人
主权项
地址
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