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发明名称
Operator's telephone circuit
摘要
申请公布号
US2030961(A)
申请公布日期
1936.02.18
申请号
US19340721810
申请日期
1934.04.21
申请人
AMERICAN TELEPHONE AND TELEGRAPH COMPANY
发明人
CARTER HERMAN T.
分类号
H04M5/10
主分类号
H04M5/10
代理机构
代理人
主权项
地址
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