| http://www.w3.org/ns/prov#value | - The optical fibers 29 of this row are for this purpose connected by a cable 40 to a central unit (not shown) in which there is a preferably monochromatic light source, for example a light emitting diode or a laser diode, the light of which irradiated into the optical fibers 29 which, together with light source (which is not shown), form a light irradiation means 27 for controlled illumination of a
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