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经营范围
发明名称
Combined guide and scraper
摘要
申请公布号
US2237863(A)
申请公布日期
1941.04.08
申请号
US19400320489
申请日期
1940.02.23
申请人
DONALDSON JOHN C
发明人
DONALDSON JOHN C.
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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