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发明名称
Drill
摘要
申请公布号
US2529788(A)
申请公布日期
1950.11.14
申请号
US19480037211
申请日期
1948.07.06
申请人
SIGNELL CARL A
发明人
SIGNELL CARL A.
分类号
E21B10/38;E21B10/58;E21B10/62;E21B10/627
主分类号
E21B10/38
代理机构
代理人
主权项
地址
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