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发明名称
Well-drill rotary table
摘要
申请公布号
US1772368(A)
申请公布日期
1930.08.05
申请号
US19250006535
申请日期
1925.02.03
申请人
WALDO SHELDON
发明人
SHELDON WALDO
分类号
E21B3/04
主分类号
E21B3/04
代理机构
代理人
主权项
地址
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