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发明名称
Mud saver
摘要
申请公布号
US1835444(A)
申请公布日期
1931.12.08
申请号
US19310508454
申请日期
1931.01.13
申请人
TAYLOR WILLIAM H
发明人
TAYLOR WILLIAM H.
分类号
E21B21/10
主分类号
E21B21/10
代理机构
代理人
主权项
地址
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