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发明名称
Directional power relay control means
摘要
申请公布号
US2023653(A)
申请公布日期
1935.12.10
申请号
US19340743979
申请日期
1934.09.14
申请人
WARD ROBERT I
发明人
WARD ROBERT I.
分类号
H02H3/027
主分类号
H02H3/027
代理机构
代理人
主权项
地址
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