| http://www.w3.org/ns/prov#value | - The detector 188 includes a light receiving element such as a photocell or a photodiode having a light receiving sensitivity to the infrared region of light, an optical filter fitted to a light receiving face of the light receiving element for selectively passing only the wavelength of the fluorescent light emitted from the mark 84, and a light guide similar to the light guide used on the light so
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