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经营范围
发明名称
Liner perforator and undercutter
摘要
申请公布号
US2214811(A)
申请公布日期
1940.09.17
申请号
US19380229696
申请日期
1938.09.13
申请人
LEO T. LANGER
发明人
COLMERAUER ANDREW J.
分类号
E21B29/00
主分类号
E21B29/00
代理机构
代理人
主权项
地址
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