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经营范围
发明名称
Drilling of bore holes
摘要
申请公布号
US1848762(A)
申请公布日期
1932.03.08
申请号
US19300494946
申请日期
1930.11.11
申请人
EDWARD ATKINSON ALBERT
发明人
ATKINSON ALBERT EDWARD
分类号
E21B10/00;E21B10/26
主分类号
E21B10/00
代理机构
代理人
主权项
地址
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