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经营范围
发明名称
Multiple stage rotary drill
摘要
申请公布号
US1819303(A)
申请公布日期
1931.08.18
申请号
US19250041183
申请日期
1925.07.02
申请人
REED WARREN B;WALTER HEPLER
发明人
REED WARREN B.;HEPLER WALTER
分类号
E21B10/26
主分类号
E21B10/26
代理机构
代理人
主权项
地址
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