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发明名称
Rock drilling mechanism
摘要
申请公布号
US2183793(A)
申请公布日期
1939.12.19
申请号
US19360094501
申请日期
1936.08.06
申请人
SULLIVAN MACHINERY COMPANY
发明人
GRAHAM JAMES G.
分类号
E21B19/086
主分类号
E21B19/086
代理机构
代理人
主权项
地址
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