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经营范围
发明名称
Operator's position circuit
摘要
申请公布号
US2249362(A)
申请公布日期
1941.07.15
申请号
US19400327563
申请日期
1940.04.03
申请人
BELL TELEPHONE LABORATORIES, INCORPORATED
发明人
IRVINE FRANK S.
分类号
H04Q3/00
主分类号
H04Q3/00
代理机构
代理人
主权项
地址
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