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发明名称
Method of and means for cleaning wells
摘要
申请公布号
US2312018(A)
申请公布日期
1943.02.23
申请号
US19390291087
申请日期
1939.08.19
申请人
BECKMAN FRED G
发明人
BECKMAN FRED G.
分类号
E21B21/00;E21B21/10;E21B37/00;E21B49/02
主分类号
E21B21/00
代理机构
代理人
主权项
地址
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