| 发明名称 |
Two-way communication sign is readable even when sun is low in sky |
| 摘要 |
In front of the support plate (10) is a contrast shutter (14) provided with a number of holes arranged in a corresponding matrix and aligned with the light diodes (12). The holes in the contrast shutter are not round in shape and their internal width in the horizontal is greater than in the vertical.
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| 申请公布号 |
FR2790581(A1) |
申请公布日期 |
2000.09.08 |
| 申请号 |
FR19990015563 |
申请日期 |
1999.12.10 |
| 申请人 |
ADOLF NISSEN ELEKTROBAU GMBH + CO.KG. |
发明人 |
GABRIEL HANS ADOLF |
| 分类号 |
G09F9/33;(IPC1-7):G09F9/30 |
主分类号 |
G09F9/33 |
| 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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