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经营范围
发明名称
Reversing tool
摘要
申请公布号
US2462478(A)
申请公布日期
1949.02.22
申请号
US19450597705
申请日期
1945.06.05
申请人
ROBERTHA EDWARDS FRANCES
发明人
EDWARDS FRANCES ROBERTHA
分类号
E21B31/107
主分类号
E21B31/107
代理机构
代理人
主权项
地址
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