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发明名称
Roller cutter organization for earth boring drills
摘要
申请公布号
US2177332(A)
申请公布日期
1939.10.24
申请号
US19380189020
申请日期
1938.02.05
申请人
CHICAGO PNEUMATIC TOOL COMPANY
发明人
REED CLARENCE E.
分类号
E21B10/16
主分类号
E21B10/16
代理机构
代理人
主权项
地址
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