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发明名称
Floor trap signaling device
摘要
申请公布号
US2014474(A)
申请公布日期
1935.09.17
申请号
US19300461732
申请日期
1930.06.17
申请人
AMERICAN DISTRICT TELEGRAPH COMPANY
发明人
HOPKINS RICHARD M.
分类号
G08B13/10
主分类号
G08B13/10
代理机构
代理人
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地址
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