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经营范围
发明名称
An improved hydraulic pit prop
摘要
申请公布号
GB1071672(A)
申请公布日期
1967.06.14
申请号
GB19630030058
申请日期
1963.07.30
申请人
W.E. & F. DOBSON LIMITED
发明人
TAYLOR LAURENCE WILLIAM
分类号
E21D15/45
主分类号
E21D15/45
代理机构
代理人
主权项
地址
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