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经营范围
发明名称
A new or improved pit prop
摘要
申请公布号
GB369732(A)
申请公布日期
1932.03.31
申请号
GB19310007224
申请日期
1931.03.09
申请人
AARON BUTLER
发明人
分类号
E21D15/52
主分类号
E21D15/52
代理机构
代理人
主权项
地址
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