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发明名称
PNEUMATIC DAM,ESPECIALLY FOR GALLERY HEADINGS
摘要
申请公布号
PL119726(B1)
申请公布日期
1982.01.30
申请号
PL19790216857
申请日期
1979.07.03
申请人
发明人
分类号
E21F;E21F5/00;E21F11/00;(IPC1-7):E21F5/00
主分类号
E21F
代理机构
代理人
主权项
地址
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