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发明名称
Improvements relating to manhole and gully tops
摘要
申请公布号
GB784908(A)
申请公布日期
1957.10.16
申请号
GB19550004446
申请日期
1955.02.15
申请人
ARTHUR SPENCER
发明人
分类号
E02D29/14
主分类号
E02D29/14
代理机构
代理人
主权项
地址
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