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发明名称
Pitman bearing
摘要
申请公布号
US2271741(A)
申请公布日期
1942.02.03
申请号
US19390269927
申请日期
1939.04.25
申请人
EMSCO DERRICK & EQUIPMENT COMPANY
发明人
MANSFIELD WARREN M.
分类号
E21B1/02;F16C9/04
主分类号
E21B1/02
代理机构
代理人
主权项
地址
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