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经营范围
发明名称
Bearing structure
摘要
申请公布号
US2127796(A)
申请公布日期
1938.08.23
申请号
US19370175109
申请日期
1937.11.17
申请人
WILLIS ORVIS C
发明人
WILLIS ORVIS C.
分类号
E21B17/10
主分类号
E21B17/10
代理机构
代理人
主权项
地址
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