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发明名称
POSITION RESTORING DEVICES FOR MINE ROOF PROPS
摘要
申请公布号
US3530678(A)
申请公布日期
1970.09.29
申请号
USD3530678
申请日期
1968.04.29
申请人
KARL MARIE GROETSCHEL
发明人
KARL MARIE GROETSCHEL
分类号
E21D23/04;(IPC1-7):E21D23/00
主分类号
E21D23/04
代理机构
代理人
主权项
地址
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