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发明名称
DEVICE TO PROTECT DUST SPREADING AND TO PROTECT WORKER
摘要
申请公布号
KR20050040138(A)
申请公布日期
2005.05.03
申请号
KR20030075168
申请日期
2003.10.27
申请人
HAN, DONG DEOK;JEON, JONG HYUN
发明人
HAN, DONG DEOK;JEON, JONG HYUN
分类号
E21B12/00;(IPC1-7):E21B12/00
主分类号
E21B12/00
代理机构
代理人
主权项
地址
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