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发明名称
Rock drill
摘要
申请公布号
US2251224(A)
申请公布日期
1941.07.29
申请号
US19400344954
申请日期
1940.07.11
申请人
SULLIVAN MACHINERY COMPANY
发明人
CURTIS JOHN C.
分类号
E21B21/01
主分类号
E21B21/01
代理机构
代理人
主权项
地址
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