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发明名称
Float collar and guide shoe
摘要
申请公布号
US2212086(A)
申请公布日期
1940.08.20
申请号
US19360107770
申请日期
1936.10.27
申请人
THORNHILL CHARLES W
发明人
THORNHILL CHARLES W.
分类号
E21B21/10
主分类号
E21B21/10
代理机构
代理人
主权项
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