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发明名称
Four-party station identification circuit
摘要
申请公布号
US2901544(A)
申请公布日期
1959.08.25
申请号
US19540479143
申请日期
1954.12.31
申请人
AMERICAN TELEPHONE AND TELEGRAPH COMPANY
发明人
COLLINS JOHN J.
分类号
H04Q5/00;H04Q5/02
主分类号
H04Q5/00
代理机构
代理人
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