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经营范围
发明名称
Well cleaning apparatus
摘要
申请公布号
US2293442(A)
申请公布日期
1942.08.18
申请号
US19400333738
申请日期
1940.05.07
申请人
MONTGOMERY HUGH A
发明人
MONTGOMERY HUGH A.
分类号
E21B37/00
主分类号
E21B37/00
代理机构
代理人
主权项
地址
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