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经营范围
发明名称
MINING EQUIPMENT
摘要
申请公布号
GB1503690(A)
申请公布日期
1978.03.15
申请号
GB19750027262
申请日期
1976.06.18
申请人
COAL IND LTD
发明人
分类号
E21C25/68;E21C35/22;(IPC1-7):E21C35/22
主分类号
E21C25/68
代理机构
代理人
主权项
地址
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