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发明名称
TWO-STAGE HYDRAULIC ROOF SUPPORT FOR COAL BEDS WITH CRUMP HAZARD
摘要
申请公布号
PL291722(A1)
申请公布日期
1993.03.22
申请号
PL19910291722
申请日期
1991.09.13
申请人
MASZYN GLINIK SPOLKA AKCYJNA F
发明人
SERAFIN LESZEK;MYSLIWIEC KAROL;ZABIEROWSKI STANISLAW;CHRAMEGA JAN;SLUSARZ RYSZARD;SLYS TADEUSZ
分类号
E21C39/00;E21D15/51;(IPC1-7):E21D15/51
主分类号
E21C39/00
代理机构
代理人
主权项
地址
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