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经营范围
发明名称
METHOD OF MINING COAL BEDS
摘要
申请公布号
PL321098(A1)
申请公布日期
1999.01.18
申请号
PL19970321098
申请日期
1997.07.10
申请人
GLOWNY INSTYTUT GORNICTWA
发明人
CHLECH JOZEF ROMAN;RULKA KAZIMIERZ;TROJNAR ANDRZEJ
分类号
E21C41/18;(IPC1-7):E21C41/18
主分类号
E21C41/18
代理机构
代理人
主权项
地址
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