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发明名称
Improvements in pit props
摘要
申请公布号
GB785234(A)
申请公布日期
1957.10.23
申请号
GB19550006484
申请日期
1955.03.04
申请人
HANS GERLACH
发明人
分类号
E21D15/42
主分类号
E21D15/42
代理机构
代理人
主权项
地址
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