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发明名称
Electromagnetic annunciator unit
摘要
申请公布号
US2504012(A)
申请公布日期
1950.04.11
申请号
US19480002879
申请日期
1948.01.17
申请人
EDWARDS COMPANY, INC.
发明人
EDWARDS ROBERT S.
分类号
G08B5/28
主分类号
G08B5/28
代理机构
代理人
主权项
地址
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