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发明名称
AIR ROTARY DRILL BIT
摘要
申请公布号
US3420324(A)
申请公布日期
1969.01.07
申请号
USD3420324
申请日期
1966.04.15
申请人
HERBERT J. VESPER
发明人
HERBERT J. VESPER
分类号
E21B10/18;E21B21/16;(IPC1-7):E21B9/08
主分类号
E21B10/18
代理机构
代理人
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