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发明名称
Telephone signalling circuits
摘要
申请公布号
US3235669(A)
申请公布日期
1966.02.15
申请号
US19630252165
申请日期
1963.01.17
申请人
NORTHERN ELECTRIC COMPANY, LIMITED
发明人
LANHAM EDWARD HERBERT
分类号
H04Q1/30
主分类号
H04Q1/30
代理机构
代理人
主权项
地址
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