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发明名称
Electromagnetic device
摘要
申请公布号
US1816558(A)
申请公布日期
1931.07.28
申请号
US19280290809
申请日期
1928.07.06
申请人
BELL TELEPHONE LABORATORIES, INCORPORATED
发明人
ZUPA FRANK A.
分类号
H01H51/22
主分类号
H01H51/22
代理机构
代理人
主权项
地址
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