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发明名称
Friction control for casing spinning apparatus
摘要
申请公布号
US1831853(A)
申请公布日期
1931.11.17
申请号
US19290336811
申请日期
1929.02.01
申请人
FOSTER WALTER W
发明人
FOSTER WALTER W.
分类号
E21B19/16
主分类号
E21B19/16
代理机构
代理人
主权项
地址
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