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发明名称
Mine prop
摘要
申请公布号
US2912211(A)
申请公布日期
1959.11.10
申请号
US19570670538
申请日期
1957.07.08
申请人
HERMAN SCHWARZ K.G.
发明人
HEUSNER WILHELM L. G.
分类号
E21D15/51;E21D23/00
主分类号
E21D15/51
代理机构
代理人
主权项
地址
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