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Application of braid groups for information processing

A light guiding plate integral with a dial board proper of a transparent material is formed with a light reflecting surface which is such constructed that the light entering the light guiding plate from a top of the same is reflected by the light reflecting surface to be directed toward a portion, where the light guiding plate and the dial board proper are integrally connected, for focalization of the light in the vicinity of an opening of the dial board proper through which a spindle of a movement passes.