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经营范围
发明名称
Threadless interlocking rotary drill pipe coupling
摘要
申请公布号
US2121710(A)
申请公布日期
1938.06.21
申请号
US19370143370
申请日期
1937.05.18
申请人
JOHN W. RICKETTS;DAVID A. DAVINI;RANDAL F. DICKEY
发明人
NIELSEN ADOLPH E.
分类号
E21B17/046
主分类号
E21B17/046
代理机构
代理人
主权项
地址
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