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发明名称
Improvements in pit props
摘要
申请公布号
GB851419(A)
申请公布日期
1960.10.19
申请号
GB19570011043
申请日期
1957.04.04
申请人
KARL GERLACH;HANS GERLACH
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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