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经营范围
发明名称
Improvements in or relating to telephone signalling arrangements
摘要
申请公布号
GB1009247(A)
申请公布日期
1965.11.10
申请号
GB19640003195
申请日期
1964.01.24
申请人
AUTOMATIC ELECTRIC LABORATORIES, INC.
发明人
分类号
H04M1/50
主分类号
H04M1/50
代理机构
代理人
主权项
地址
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