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发明名称
Double-acting drill bit
摘要
申请公布号
US2519861(A)
申请公布日期
1950.08.22
申请号
US19470722003
申请日期
1947.01.14
申请人
JOHN D. BILBAO;HARRY POVEY
发明人
TURNER FRANK G.
分类号
E21B10/00;E21B10/36
主分类号
E21B10/00
代理机构
代理人
主权项
地址
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