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发明名称
RAISE DRILL
摘要
申请公布号
AU3941778(A)
申请公布日期
1980.03.06
申请号
AU19780039417
申请日期
1978.08.30
申请人
SMITH INTERNATIONAL, INC.
发明人
GEORGE A. ALTHER
分类号
E21B10/10;E21B7/28;E21B17/07;E21D3/00;F16D3/74
主分类号
E21B10/10
代理机构
代理人
主权项
地址
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