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发明名称
Door signal device
摘要
申请公布号
US2463832(A)
申请公布日期
1949.03.08
申请号
US19470774508
申请日期
1947.09.17
申请人
EDWARDS AND COMPANY, INC.
发明人
VERKUIL LEO L.
分类号
G08B3/02
主分类号
G08B3/02
代理机构
代理人
主权项
地址
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