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发明名称
Mining machine
摘要
申请公布号
US2111670(A)
申请公布日期
1938.03.22
申请号
US19360116001
申请日期
1936.12.15
申请人
MCCULLOUGH DAVID R
发明人
MCCULLOUGH DAVID R.
分类号
E21B7/02;E21C27/24
主分类号
E21B7/02
代理机构
代理人
主权项
地址
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