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发明名称
HOLDING TONE TRANSMISSION SYSTEM
摘要
申请公布号
JPH04321363(A)
申请公布日期
1992.11.11
申请号
JP19910088917
申请日期
1991.04.20
申请人
NEC CORP
发明人
AKAGI KATSU
分类号
H04M3/42;H04M19/02;H04Q3/545
主分类号
H04M3/42
代理机构
代理人
主权项
地址
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