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发明名称
METHOD OF PREDICTING LOCATIONS THREATENED WITH CRUMPS AND FALLS OF ROOF
摘要
申请公布号
PL269692(A1)
申请公布日期
1988.09.15
申请号
PL19870269692
申请日期
1987.12.02
申请人
INST GORNICTWA NAFTOWEGO I GAZ
发明人
GRZYWACZ MACIEJ
分类号
E21C;(IPC1-7):E21C/
主分类号
E21C
代理机构
代理人
主权项
地址
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