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发明名称
Mining apparatus
摘要
申请公布号
US2099373(A)
申请公布日期
1937.11.16
申请号
US19340722568
申请日期
1934.04.26
申请人
SULLIVAN MACHINERY COMPANY
发明人
RICHARDS DWIGHT R.
分类号
E21C31/00
主分类号
E21C31/00
代理机构
代理人
主权项
地址
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