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发明名称
Roller cutter assembly for earth boring drills
摘要
申请公布号
US2075998(A)
申请公布日期
1937.04.06
申请号
US19350033882
申请日期
1935.07.30
申请人
CHICAGO PNEUMATIC TOOL COMPANY
发明人
REED CLARENCE E.
分类号
E21B10/22
主分类号
E21B10/22
代理机构
代理人
主权项
地址
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