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发明名称
Well cleaning
摘要
申请公布号
US2309697(A)
申请公布日期
1943.02.02
申请号
US19400371659
申请日期
1940.12.26
申请人
LAYNE-NORTHERN COMPANY, INCORPORATED
发明人
GUNDERSON NORRIS E.
分类号
E21B37/08
主分类号
E21B37/08
代理机构
代理人
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