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发明名称
Magnetic field direction finder
摘要
申请公布号
US2158500(A)
申请公布日期
1939.05.16
申请号
US19370123811
申请日期
1937.02.03
申请人
UGO GUERRA
发明人
GUERRA UGO
分类号
主分类号
代理机构
代理人
主权项
地址
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