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经营范围
发明名称
Rotary drill bit
摘要
申请公布号
US2901222(A)
申请公布日期
1959.08.25
申请号
US19570688335
申请日期
1957.10.04
申请人
PEASE JR GEORGE W
发明人
JR. GEORGE W. PEASE,
分类号
E21B10/54
主分类号
E21B10/54
代理机构
代理人
主权项
地址
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