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发明名称
Improvements in pit-prop locking devices
摘要
申请公布号
GB731185(A)
申请公布日期
1955.06.01
申请号
GB19520030955
申请日期
1952.12.05
申请人
GUTEHOFFNUNGSHUETTE OBERHAUSEN AKTIENGESELLSCHAFT
发明人
分类号
E21D15/28
主分类号
E21D15/28
代理机构
代理人
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