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发明名称
Drill attachment
摘要
申请公布号
US2835474(A)
申请公布日期
1958.05.20
申请号
US19550506236
申请日期
1955.05.05
申请人
UNEXCELLED DIE & SUPPLY CO.
发明人
O'CONNOR THOMAS J.;SULLIVAN WILLIAM J.
分类号
E21B4/06;E21B4/08
主分类号
E21B4/06
代理机构
代理人
主权项
地址
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