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发明名称
Controlling device for well tools
摘要
申请公布号
US2387456(A)
申请公布日期
1945.10.23
申请号
US19420448112
申请日期
1942.06.23
申请人
MCDONALD JOSEPH S;RUSKA WALTER E A
发明人
MCDONALD JOSEPH S.;RUSKA WALTER E. A.
分类号
E21B43/1185
主分类号
E21B43/1185
代理机构
代理人
主权项
地址
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조미 방법
Compact, angular contact ball bearing, preferably with two rows
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