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发明名称
A HOUSE EXCHANGE TELEPHONE SYSTEM
摘要
申请公布号
HK52577(A)
申请公布日期
1977.10.20
申请号
HK19770000525
申请日期
1977.10.13
申请人
PLESSEY CO LTD
发明人
PERKINS C I;HARRISON D W;WOOD F J
分类号
H04M9/00;(IPC1-7):H04M3/00
主分类号
H04M9/00
代理机构
代理人
主权项
地址
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