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发明名称
Rock drill
摘要
申请公布号
US2103359(A)
申请公布日期
1937.12.28
申请号
US19330702107
申请日期
1933.12.13
申请人
PEYTON DU PONT, INCORPORATED
发明人
GRAHAM FRANK F.
分类号
E21B10/38;E21B10/40
主分类号
E21B10/38
代理机构
代理人
主权项
地址
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