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发明名称
Improvements relating to manhole and like covers and frames
摘要
申请公布号
GB1186860(A)
申请公布日期
1970.04.08
申请号
GB19680000701
申请日期
1968.01.04
申请人
THE DOVER ENGINEERING WORKS LIMITED
发明人
HERBERT JACK HOLDSTOCK
分类号
E02D29/14
主分类号
E02D29/14
代理机构
代理人
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