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发明名称
Stabilizer for drill collars and drill pipes
摘要
申请公布号
US2813697(A)
申请公布日期
1957.11.19
申请号
US19530361598
申请日期
1953.06.15
申请人
SECURITY ENGINEERING DIVISION, DRESSER OPERATIONS, INC.
发明人
SWART KENNETH H.
分类号
E21B17/10
主分类号
E21B17/10
代理机构
代理人
主权项
地址
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