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发明名称
An electric alarm device in connection with safety-chains for doors
摘要
申请公布号
GB636985(A)
申请公布日期
1950.05.10
申请号
GB19470033933
申请日期
1947.12.23
申请人
DANIEL GEORG MARTENS
发明人
分类号
E05B45/06
主分类号
E05B45/06
代理机构
代理人
主权项
地址
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