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发明名称
Supervisory telephone circuit
摘要
申请公布号
US3242263(A)
申请公布日期
1966.03.22
申请号
US19620236363
申请日期
1962.11.08
申请人
HERSEY RALPH E
发明人
HERSEY RALPH E.
分类号
H04M15/10
主分类号
H04M15/10
代理机构
代理人
主权项
地址
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