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经营范围
发明名称
DIGITAL EXCHANGE
摘要
申请公布号
JPH02218290(A)
申请公布日期
1990.08.30
申请号
JP19890038804
申请日期
1989.02.17
申请人
NEC CORP
发明人
SATO TADASHI
分类号
H04M3/00;H04Q3/52;H04Q11/04
主分类号
H04M3/00
代理机构
代理人
主权项
地址
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