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发明名称
MINING METHOD
摘要
申请公布号
ZW16581(A1)
申请公布日期
1981.10.21
申请号
ZW19810000165
申请日期
1981.07.13
申请人
BOART INTERNATIONAL LTD
发明人
HOPLEY ROBERT JAMES;VAN DER WESTHUIZEN WYNAND JOHANNES
分类号
E21C41/16;(IPC1-7):E21D/
主分类号
E21C41/16
代理机构
代理人
主权项
地址
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