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发明名称
Auger screw cover of crane picering machin and the manufacturing method and discharge apparatus of earth
摘要
申请公布号
KR100548649(B1)
申请公布日期
2006.02.02
申请号
KR20030088168
申请日期
2003.12.05
申请人
发明人
分类号
E21B7/02
主分类号
E21B7/02
代理机构
代理人
主权项
地址
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