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经营范围
发明名称
Rotary drill
摘要
申请公布号
US2006128(A)
申请公布日期
1935.06.25
申请号
US19340740991
申请日期
1934.08.22
申请人
CASPERSON CARL E
发明人
CASPERSON CARL E.
分类号
E21B3/02
主分类号
E21B3/02
代理机构
代理人
主权项
地址
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