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经营范围
发明名称
Boring rifler
摘要
申请公布号
US2228709(A)
申请公布日期
1941.01.14
申请号
US19380238864
申请日期
1938.11.04
申请人
RUDDELL STUART G;THOMAS FRASER
发明人
RUDDELL STUART G.;FRASER THOMAS
分类号
E21B11/00
主分类号
E21B11/00
代理机构
代理人
主权项
地址
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