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发明名称
SOIL DISPLACEMENT HAMMER
摘要
申请公布号
AU615725(B2)
申请公布日期
1991.10.10
申请号
AU19890031715
申请日期
1989.03.28
申请人
ALLAN GEORGE KAYES
发明人
ALLAN GEORGE KAYES
分类号
E21B4/14;E21B7/06;E21B7/26;(IPC1-7):E21B7/26
主分类号
E21B4/14
代理机构
代理人
主权项
地址
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