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| Number | Title | Issue Date |
| 6078439 | Optics unit for signal, traffic and display equipment, arrangement of the same therein and method therefore A manner of mounting optical elements in the front plate of an alternating traffic sign makes possible an easily-cleaned, flat or smooth outer surface and guarantees an exact alignment of all lens elements with simultaneous sealing. An optics housing is p... | 06/20/2000 |
