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发明名称
Improvements in clamping devices for supporting mine roadway arches and like structures
摘要
申请公布号
GB873489(A)
申请公布日期
1961.07.26
申请号
GB19570039546
申请日期
1957.12.19
申请人
DOWTY MINING EQUIPMENT LIMITED
发明人
HODKINSON ALEC;MILLS JOSEPH ALEXANDER WALLACE
分类号
E21D11/22
主分类号
E21D11/22
代理机构
代理人
主权项
地址
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