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发明名称
Core drill
摘要
申请公布号
US2329405(A)
申请公布日期
1943.09.14
申请号
US19400342817
申请日期
1940.06.27
申请人
MANN ROBERT S
发明人
MANN ROBERT S.
分类号
E21B25/10
主分类号
E21B25/10
代理机构
代理人
主权项
地址
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