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发明名称
Apparatus for cutting holes in well casing
摘要
申请公布号
US2935020(A)
申请公布日期
1960.05.03
申请号
US19530372905
申请日期
1953.08.07
申请人
PAN AMERICAN PETROLEUM CORPORATION;WELEX, INC.
发明人
HOWARD GEORGE C.;CALDWELL BLAKE M.
分类号
E21B29/02
主分类号
E21B29/02
代理机构
代理人
主权项
地址
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