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经营范围
发明名称
Self-cleaning anchor
摘要
申请公布号
US2175540(A)
申请公布日期
1939.10.10
申请号
US19370159342
申请日期
1937.08.16
申请人
MORDICA O. JOHNSTON
发明人
O'NEILL FRANK E.
分类号
E21B49/08
主分类号
E21B49/08
代理机构
代理人
主权项
地址
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