发明名称 |
Manhole head assembly having a manhole top ring and method of use of the same |
摘要 |
The invention relates to a manhole head assembly of the type having a substantially vertical axis and being intended to be mounted on a conventional manhole member made of non-elastic material. The invention also relates to a manhole ring having an omni-directional upper part and to a method of use of said manhole ring.
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申请公布号 |
US5362175(A) |
申请公布日期 |
1994.11.08 |
申请号 |
US19920969108 |
申请日期 |
1992.10.30 |
申请人 |
BEGIN, GAETAN |
发明人 |
BEGIN, GAETAN |
分类号 |
E02D29/12;(IPC1-7):E02D29/14 |
主分类号 |
E02D29/12 |
代理机构 |
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代理人 |
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主权项 |
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地址 |
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