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发明名称
Circuit switching device
摘要
申请公布号
US2123256(A)
申请公布日期
1938.07.12
申请号
US19340727258
申请日期
1934.05.24
申请人
PITTMAN RALPH R;WALSH CARROLL H
发明人
PITTMAN RALPH R.;WALSH CARROLL H.
分类号
H01H75/04
主分类号
H01H75/04
代理机构
代理人
主权项
地址
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