| http://www.w3.org/ns/prov#value | - In order to perform a measurement cycle in which the color stimulus specification of the object under test 7 is determined, the conventional concave mirror 11 has to be in its rest position, i.e. swiveled to its lower position, such that the light emitted by the bulb 13 is reflected by the concave mirror 10 which is provided with the refraction grating and, thereby, directed to the input end of th
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