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经营范围
发明名称
UNDERGROUND MINING
摘要
申请公布号
GB2043741(B)
申请公布日期
1983.07.20
申请号
GB19780050349
申请日期
1978.12.29
申请人
ROY RICH SERVICES INC
发明人
分类号
E21C29/08;(IPC1-7):E21C29/06
主分类号
E21C29/08
代理机构
代理人
主权项
地址
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