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发明名称
Threadless drill pipe
摘要
申请公布号
US2257101(A)
申请公布日期
1941.09.30
申请号
US19390282163
申请日期
1939.06.30
申请人
ALEXANDER BOYNTON
发明人
BOYNTON ALEXANDER
分类号
E21B17/046;F16L15/00
主分类号
E21B17/046
代理机构
代理人
主权项
地址
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