The invention relates to an oblong sign board casing comprising a reflector sheet provided with parallel embossings extending in planes substantially perpendicular to a longitudinal axis. The profiled reflector sheet is curved about 90 DEG round a longitudinal axis, whereby a self-supporting construction is obtained. This construction renders it possible to provide the front plate with a flange and a sharp edge at the bottom. The embossings cause an effective diffusion of the light, also towards the bottom face.
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