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发明名称
An improved collapsible chock piece for use in building chocks for supporting the roofs of mines and the like
摘要
申请公布号
GB504197(A)
申请公布日期
1939.04.21
申请号
GB19370029048
申请日期
1937.10.25
申请人
EDWARD TAYLOR
发明人
分类号
E21D15/60
主分类号
E21D15/60
代理机构
代理人
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