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经营范围
发明名称
Collapsible deep well drill
摘要
申请公布号
US2173018(A)
申请公布日期
1939.09.12
申请号
US19380187269
申请日期
1938.01.27
申请人
LESTER A. CRANCER;GEORGE B. FLEISCHMAN
发明人
HURLEY WALTER G.
分类号
E21B10/32;E21B10/66
主分类号
E21B10/32
代理机构
代理人
主权项
地址
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