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经营范围
发明名称
Duplex dead end
摘要
申请公布号
US1960610(A)
申请公布日期
1934.05.29
申请号
US19290404264
申请日期
1929.11.02
申请人
WIEGAND FRED B
发明人
WIEGAND FRED B.
分类号
H02G7/05
主分类号
H02G7/05
代理机构
代理人
主权项
地址
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