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发明名称
Apparatus to detect change of voltage
摘要
申请公布号
US2408711(A)
申请公布日期
1946.10.01
申请号
US19450599677
申请日期
1945.06.15
申请人
THE UNION SWITCH & SIGNAL COMPANY
发明人
VOLZ CARL
分类号
G01P15/16
主分类号
G01P15/16
代理机构
代理人
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