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发明名称
Antifriction coupling for drill stems
摘要
申请公布号
US1923328(A)
申请公布日期
1933.08.22
申请号
US19300466310
申请日期
1930.07.07
申请人
REED CLARENCE E
发明人
REED CLARENCE E.
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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