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发明名称
Improvements in mine props
摘要
申请公布号
GB616940(A)
申请公布日期
1949.01.28
申请号
GB19460028525
申请日期
1946.09.24
申请人
EDMOND BAILY
发明人
分类号
E21D15/40
主分类号
E21D15/40
代理机构
代理人
主权项
地址
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