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经营范围
发明名称
Core orienting apparatus
摘要
申请公布号
US2974739(A)
申请公布日期
1961.03.14
申请号
US19580725164
申请日期
1958.03.31
申请人
GERALDINE C. DEAN
发明人
DEAN CHARLES A.
分类号
E21B25/16
主分类号
E21B25/16
代理机构
代理人
主权项
地址
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