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发明名称
Hydraulic pit props
摘要
申请公布号
US2816728(A)
申请公布日期
1957.12.17
申请号
US19500154411
申请日期
1950.04.06
申请人
DIETER LOBBE ARMIN
发明人
LOBBE ARMIN DIETER
分类号
E21D15/00;E21D15/44;E21D15/51;E21D15/58;E21D15/59;E21D15/60
主分类号
E21D15/00
代理机构
代理人
主权项
地址
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