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发明名称
TRANSMISSION SLEEVE FOR A DOWN HOLE HAMMER
摘要
申请公布号
AU7538691(A)
申请公布日期
1991.11.07
申请号
AU19910075386
申请日期
1991.04.24
申请人
D. T. A. PTY LTD
发明人
JOHN ELSBY;ANDREW GREATHEAD;BRIAN THOMAS SANFEAD
分类号
E21B4/14;E21B12/04
主分类号
E21B4/14
代理机构
代理人
主权项
地址
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