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发明名称
Rock duster
摘要
申请公布号
US1781509(A)
申请公布日期
1930.11.11
申请号
US19270233407
申请日期
1927.11.15
申请人
THE AMERICAN MINE DOOR COMPANY
发明人
GURNEY ALBERT J.
分类号
E21F5/10
主分类号
E21F5/10
代理机构
代理人
主权项
地址
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