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发明名称
DRILLING APPARATUS
摘要
申请公布号
US3439757(A)
申请公布日期
1969.04.22
申请号
USD3439757
申请日期
1968.03.12
申请人
WAYLAND D. ELENBURG
发明人
WAYLAND D. ELENBURG
分类号
E21B10/18;E21B17/10;E21B21/12;(IPC1-7):E21B17/10;E21B21/00;E21C9/00
主分类号
E21B10/18
代理机构
代理人
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