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发明名称
METHOD FOR DRILLING LARGE DIAMETER HOLES
摘要
申请公布号
US3539023(A)
申请公布日期
1970.11.10
申请号
USD3539023
申请日期
1969.04.01
申请人
JACK V. TEDROW
发明人
JACK V. TEDROW
分类号
E21B7/20;(IPC1-7):E21B7/00
主分类号
E21B7/20
代理机构
代理人
主权项
地址
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