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经营范围
发明名称
Rotary well bore cleaner
摘要
申请公布号
US2402223(A)
申请公布日期
1946.06.18
申请号
US19440542033
申请日期
1944.06.26
申请人
B AND W, INC.
发明人
WRIGHT KENNETH A.
分类号
E21B37/02
主分类号
E21B37/02
代理机构
代理人
主权项
地址
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