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经营范围
发明名称
Improvements in or relating to telephone set circuits
摘要
申请公布号
GB773850(A)
申请公布日期
1957.05.01
申请号
GB19550027877
申请日期
1955.09.30
申请人
WESTERN ELECTRIC COMPANY
发明人
分类号
H04M1/60
主分类号
H04M1/60
代理机构
代理人
主权项
地址
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