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发明名称
Improvements relating to hydraulic pit props or the like
摘要
申请公布号
GB864032(A)
申请公布日期
1961.03.29
申请号
GB19570021436
申请日期
1957.07.05
申请人
GUTEHOFFNUNGSHUTTE STERKRADE AKTIENGESELLSCHAFT
发明人
分类号
E21D15/51;E21D15/60
主分类号
E21D15/51
代理机构
代理人
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地址
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