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发明名称
Auger head assembly and method of drilling hard earth formations
摘要
申请公布号
AU5770294(A)
申请公布日期
1994.11.10
申请号
AU19940057702
申请日期
1994.03.09
申请人
PENGO CORPORATION
发明人
NAME NOT GIVEN
分类号
E21B10/44
主分类号
E21B10/44
代理机构
代理人
主权项
地址
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