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发明名称
Rotary drill bit.
摘要
申请公布号
ZA200307294(B)
申请公布日期
2004.07.01
申请号
ZA20030007294
申请日期
2003.09.18
申请人
MASTER DRILLING ENGINEERING (PTY) LTD.
发明人
BAREND JACOBUS JORDAAN;JACO NEL
分类号
E21B
主分类号
E21B
代理机构
代理人
主权项
地址
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