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发明名称
Improvements relating to mine roof or like supports
摘要
申请公布号
GB538277(A)
申请公布日期
1941.07.28
申请号
GB19400001133
申请日期
1940.01.18
申请人
WILLIAM HERBERT SMITH
发明人
分类号
E21D15/44;E21D15/46;E21D15/52
主分类号
E21D15/44
代理机构
代理人
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地址
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