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发明名称
EXPANDABLE UNDERREAMER
摘要
申请公布号
US3425500(A)
申请公布日期
1969.02.04
申请号
USD3425500
申请日期
1966.11.25
申请人
BENJAMIN H. FUCHS
发明人
BENJAMIN H. FUCHS
分类号
E21B10/18;E21B10/34;(IPC1-7):E21B9/26
主分类号
E21B10/18
代理机构
代理人
主权项
地址
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