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经营范围
发明名称
Apparatus for plugging wells
摘要
申请公布号
US2651371(A)
申请公布日期
1953.09.08
申请号
US19480051350
申请日期
1948.09.27
申请人
TOELKE LESTER W
发明人
TOELKE LESTER W.
分类号
E21B33/1295
主分类号
E21B33/1295
代理机构
代理人
主权项
地址
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