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经营范围
发明名称
Paraffin cleaner for oil wells
摘要
申请公布号
US2298985(A)
申请公布日期
1942.10.13
申请号
US19400355512
申请日期
1940.09.05
申请人
STILL CUTHBERT A;STILL ALDRICH C
发明人
STILL CUTHBERT A.;STILL ALDRICH C.
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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