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经营范围
发明名称
Improvements in or relating to phase conversion of electrical energy
摘要
申请公布号
GB647435(A)
申请公布日期
1950.12.13
申请号
GB19480006584
申请日期
1948.03.02
申请人
FREDERICK BUTLER
发明人
分类号
H01F30/14
主分类号
H01F30/14
代理机构
代理人
主权项
地址
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