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发明名称
Kelly saver drive
摘要
A split, solid mass, drive bushing-drive plate for use when a kelly is used to sever a length of well casing. The invention fits into the master bushing and prevents wear on the corners between the flat sides of the kelly.
申请公布号
US5107941(A)
申请公布日期
1992.04.28
申请号
US19900515555
申请日期
1990.04.26
申请人
GRESHAM, WILLIAM J.
发明人
GRESHAM, WILLIAM J.
分类号
E21B3/04;E21B17/10;E21B29/00
主分类号
E21B3/04
代理机构
代理人
主权项
地址
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