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发明名称
Automatic paraffin scraper
摘要
申请公布号
US3216502(A)
申请公布日期
1965.11.09
申请号
US19640394538
申请日期
1964.09.04
申请人
GEM OIL TOOL CO., INC.
发明人
LEATHERS WILLIAM D.;GRESHAM LEROY Q.
分类号
E21B37/02
主分类号
E21B37/02
代理机构
代理人
主权项
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