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发明名称
Drill bit
摘要
申请公布号
US3113630(A)
申请公布日期
1963.12.10
申请号
US19600067957
申请日期
1960.11.08
申请人
EDWARD B. WILLIAMS III;JOSEPH W. WILLIAMS;DAVID B. WILLIAMS
发明人
JR. EDWARD B. WILLIAMS,
分类号
E21B10/18;E21B10/22
主分类号
E21B10/18
代理机构
代理人
主权项
地址
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