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经营范围
发明名称
Drilling apparatus
摘要
申请公布号
US2615683(A)
申请公布日期
1952.10.28
申请号
US19440559982
申请日期
1944.10.23
申请人
JOY MANUFACTURING COMPANY
发明人
MCCALLUM ROBERT ANTHONY
分类号
E21B19/081
主分类号
E21B19/081
代理机构
代理人
主权项
地址
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