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发明名称
A METHOD FOR VENTILATION OF THE BLIND HEADINGS AND AN INSTALLATION FOR VENTILATION THEREFOR
摘要
申请公布号
PL275696(A1)
申请公布日期
1990.05.14
申请号
PL19880275696
申请日期
1988.11.07
申请人
GWIAZDA JAN B
发明人
GWIAZDA JAN B
分类号
E21D23/00;E21F;E21F15/00;E21F15/04;(IPC1-7):E21F/
主分类号
E21D23/00
代理机构
代理人
主权项
地址
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