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发明名称
Electromagnetic bell
摘要
申请公布号
US2099929(A)
申请公布日期
1937.11.23
申请号
US19310545355
申请日期
1931.06.18
申请人
SIGNAL ENGINEERING & MANUFACTURING COMPANY
发明人
EBERT JOSEPH F.
分类号
G10K1/067
主分类号
G10K1/067
代理机构
代理人
主权项
地址
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