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发明名称
Mine prop
摘要
申请公布号
US2158018(A)
申请公布日期
1939.05.09
申请号
US19370140014
申请日期
1937.04.30
申请人
WITTMAN FREDERICK M;PARRACK HARRY H
发明人
WITTMAN FREDERICK M.;PARRACK HARRY H.
分类号
E21D15/24
主分类号
E21D15/24
代理机构
代理人
主权项
地址
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