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发明名称
ONE-SIDED DIGITAL COMMUTATION FIELD
摘要
申请公布号
PL148745(B1)
申请公布日期
1989.11.30
申请号
PL19850254881
申请日期
1985.08.05
申请人
发明人
分类号
H04M;H04Q;H04Q11/04;(IPC1-7):H04Q11/04
主分类号
H04M
代理机构
代理人
主权项
地址
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