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发明名称
VALVING ARRANGEMENT FOR AUTOMATICALLY INCREASING PRESSURE IN HYDRAULIC PROPS OF A SELF-ADVANCING ROOF SUPPORT
摘要
申请公布号
PL156347(B1)
申请公布日期
1992.02.28
申请号
PL19870268199
申请日期
1987.10.13
申请人
发明人
分类号
E21D;E21D15/51;F16K;(IPC1-7):E21D15/51
主分类号
E21D
代理机构
代理人
主权项
地址
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