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发明名称
Drill cutting head
摘要
申请公布号
US2960312(A)
申请公布日期
1960.11.15
申请号
US19570664249
申请日期
1957.06.07
申请人
KANDLE CHARLES W
发明人
KANDLE CHARLES W.
分类号
E21B10/04;E21B10/26;E21B10/42
主分类号
E21B10/04
代理机构
代理人
主权项
地址
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