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经营范围
发明名称
Detachable bit rock drill
摘要
申请公布号
US2257418(A)
申请公布日期
1941.09.30
申请号
US19380199200
申请日期
1938.03.31
申请人
INTERNATIONAL DETACHABLE BITS & EQUIPMENT, LIMITED
发明人
KNUTSON GUSTAVE
分类号
E21B17/046
主分类号
E21B17/046
代理机构
代理人
主权项
地址
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