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经营范围
发明名称
Improvements in and relating to locks for pit props
摘要
申请公布号
GB715377(A)
申请公布日期
1954.09.15
申请号
GB19520032129
申请日期
1952.12.18
申请人
GUTEHFFNUNGSHUTTE OBERHAUSEN AKTIENGESELLSCHAFT
发明人
分类号
E21D15/28;E21D15/42
主分类号
E21D15/28
代理机构
代理人
主权项
地址
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