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经营范围
发明名称
An improved pit-prop
摘要
申请公布号
GB533991(A)
申请公布日期
1941.02.25
申请号
GB19390032125
申请日期
1939.12.13
申请人
CLIFFORD HUMPHREYS
发明人
分类号
E21D15/18
主分类号
E21D15/18
代理机构
代理人
主权项
地址
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