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发明名称
METHOD OF SUPORTING ROOF STRATA CHARACTERIZED BY LOW FIRMNESS OF SOIL CONSITUTING THEM
摘要
申请公布号
PL275905(A1)
申请公布日期
1990.05.28
申请号
PL19880275905
申请日期
1988.11.18
申请人
KOPALNIA WEGLA KAMIENNEGO WAWE
发明人
PUSTOWKA BOGUSLAW;ORZECHOWSKI HENRYK;CHOLEWINSKI ALEKSANDER;BLUSZCZ PIOTR
分类号
E21D;(IPC1-7):E21D/
主分类号
E21D
代理机构
代理人
主权项
地址
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