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经营范围
发明名称
Combination earth augers and underreamers
摘要
申请公布号
US2836396(A)
申请公布日期
1958.05.27
申请号
US19560576383
申请日期
1956.04.05
申请人
RAWLINSON SR CHARLES D
发明人
SR. CHARLES D. RAWLINSON,
分类号
E21B10/44
主分类号
E21B10/44
代理机构
代理人
主权项
地址
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