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经营范围
发明名称
MINING METHOD
摘要
申请公布号
US3586379(A)
申请公布日期
1971.06.22
申请号
USD3586379
申请日期
1969.09.24
申请人
BECHTEL INTERNATIONAL CORP.
发明人
CHARLES A.R. LAMBLY
分类号
E21C41/16;E21C41/22;(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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