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发明名称
Drill pipe spinner
摘要
申请公布号
US2400712(A)
申请公布日期
1946.05.21
申请号
US19430493473
申请日期
1943.07.03
申请人
CHARLES PRATHER;RAYDBERG FRED A
发明人
PRATHER CHARLES;RAYDBERG FRED A.
分类号
E21B19/16
主分类号
E21B19/16
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代理人
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