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发明名称
Electromagnetic device
摘要
申请公布号
US1824724(A)
申请公布日期
1931.09.22
申请号
US19260152475
申请日期
1926.12.03
申请人
GENERAL ELECTRIC COMPANY
发明人
KELLOGG EDWARD W.
分类号
E21F15/06;H04R7/14;H04R7/20;H04R11/00
主分类号
E21F15/06
代理机构
代理人
主权项
地址
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