| 摘要 |
Signs comprising an outer layer having indicia thereon and a thermal reservoir behind the outer layer. The thermal reservoir contains at least one phase change material that, during periods of falling ambient temperature, yields a latent heat of transition thereby tending to maintain the temperature of the outer layer above what it would otherwise have been. As a result of such higher temperature, the outer layer of the sign is more resistant to formation of dew or frost thereon and retains a greater degree of legibility.
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