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经营范围
发明名称
Electromagnetic bell
摘要
申请公布号
US1797013(A)
申请公布日期
1931.03.17
申请号
US19230658668
申请日期
1923.08.22
申请人
MORAN JOHN F
发明人
MORAN JOHN F.
分类号
G10K1/064
主分类号
G10K1/064
代理机构
代理人
主权项
地址
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