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经营范围
发明名称
KEY TELEPHONE CIRCUIT
摘要
申请公布号
GB1534459(A)
申请公布日期
1978.12.06
申请号
GB19770044521
申请日期
1977.10.26
申请人
WESTERN ELECTRIC CO INC
发明人
分类号
H04Q3/58;H04M9/00;(IPC1-7):H04M3/42;H04Q5/18
主分类号
H04Q3/58
代理机构
代理人
主权项
地址
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