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经营范围
发明名称
Jet bit
摘要
申请公布号
US3329222(A)
申请公布日期
1967.07.04
申请号
US19640413245
申请日期
1964.11.23
申请人
SMITH INDUSTRIES INTERNATIONAL, INC.
发明人
NEILSON WILLIAM J.
分类号
E21B10/18
主分类号
E21B10/18
代理机构
代理人
主权项
地址
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