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发明名称
Emergency alarm system
摘要
申请公布号
US2520340(A)
申请公布日期
1950.08.29
申请号
US19470733451
申请日期
1947.03.10
申请人
SIRMAN ROBINSON
发明人
ROBINSON SIRMAN
分类号
G08B17/06;H04M11/04
主分类号
G08B17/06
代理机构
代理人
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地址
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