| 发明名称 |
Improvements to underground tubular ducts for telecommunications networks |
| 摘要 |
A duct for housing cables for underground telecommunications networks comprises one or more tubular elements (1) of a first plastic material, having helical ribs (2a, 2b; 3) on their inner surface. The ribs may also be formed as inserts into the material of the tubular element (1). <IMAGE> |
| 申请公布号 |
EP0732789(A1) |
申请公布日期 |
1996.09.18 |
| 申请号 |
EP19960103850 |
申请日期 |
1996.03.12 |
| 申请人 |
CSELT CENTRO STUDI E LABORATORI TELECOMUNICAZIONI S.P.A. |
发明人 |
COCITO, GIUSEPPE |
| 分类号 |
B29D23/00;B29K23/00;G02B6/44;H02G1/06;H02G1/08;H02G9/06 |
主分类号 |
B29D23/00 |
| 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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