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发明名称
Electromagnetic device
摘要
申请公布号
US1762774(A)
申请公布日期
1930.06.10
申请号
US19280285519
申请日期
1928.06.15
申请人
BELL TELEPHONE LABORATORIES, INCORPORATED
发明人
FRY JACOB R.
分类号
G01R11/30
主分类号
G01R11/30
代理机构
代理人
主权项
地址
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