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发明名称
Oil well casing scraper
摘要
申请公布号
US2464390(A)
申请公布日期
1949.03.15
申请号
US19450597330
申请日期
1945.06.02
申请人
OTTO HAMMER
发明人
HAMMER OTTO
分类号
E21B37/02
主分类号
E21B37/02
代理机构
代理人
主权项
地址
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