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经营范围
发明名称
Well spudding apparatus
摘要
申请公布号
US2028697(A)
申请公布日期
1936.01.21
申请号
US19340726403
申请日期
1934.05.18
申请人
THE ALL STEEL PRODUCTS MANUFACTURING COMPANY
发明人
CARDWELL HARLAND W.
分类号
E21B1/02
主分类号
E21B1/02
代理机构
代理人
主权项
地址
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