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经营范围
发明名称
MINING METHOD
摘要
申请公布号
GB2079823(A)
申请公布日期
1982.01.27
申请号
GB19810021916
申请日期
1981.07.16
申请人
BOART INTERNATIONAL LTD
发明人
分类号
E21C41/16;(IPC1-7):E21C41/00
主分类号
E21C41/16
代理机构
代理人
主权项
地址
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