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经营范围
发明名称
ROCK DRILL ROD
摘要
申请公布号
US3554308(A)
申请公布日期
1971.01.12
申请号
USD3554308
申请日期
1968.12.12
申请人
INGERSOLL-RAND CO.
发明人
J.D. DITSON
分类号
E21B17/22;(IPC1-7):E21B17/04
主分类号
E21B17/22
代理机构
代理人
主权项
地址
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