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发明名称
Method of making drilling bits
摘要
申请公布号
US3127794(A)
申请公布日期
1964.04.07
申请号
US19620217391
申请日期
1962.08.16
申请人
HUGHES TOOL COMPANY
发明人
JR. JESSE L. STOCKARD,
分类号
E21B10/42;E21B10/54;E21B10/62
主分类号
E21B10/42
代理机构
代理人
主权项
地址
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