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经营范围
发明名称
Antifriction bearing assembly for drills
摘要
申请公布号
US2004013(A)
申请公布日期
1935.06.04
申请号
US19340734662
申请日期
1934.07.11
申请人
REED CLARENCE E
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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