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发明名称
Improvements in magnet structure
摘要
申请公布号
GB501708(A)
申请公布日期
1939.03.03
申请号
GB19380017017
申请日期
1938.06.08
申请人
CINAUDAGRAPH CORPORATION
发明人
分类号
H04R9/02
主分类号
H04R9/02
代理机构
代理人
主权项
地址
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