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发明名称
Improvements in or relating to mining chocks and the like
摘要
申请公布号
GB767561(A)
申请公布日期
1957.02.06
申请号
GB19520017801
申请日期
1952.07.15
申请人
GULLICK LIMITED;TOM SEAMAN
发明人
分类号
E21D15/60
主分类号
E21D15/60
代理机构
代理人
主权项
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