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发明名称
Safety device for mines
摘要
申请公布号
US1950951(A)
申请公布日期
1934.03.13
申请号
US19330650028
申请日期
1933.01.03
申请人
RANKIN JOHN W
发明人
RANKIN JOHN W.
分类号
E21F11/00
主分类号
E21F11/00
代理机构
代理人
主权项
地址
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