| http://www.w3.org/ns/prov#value | - One position is an operative position to successfully reflect the radiation coming from the fields of view and once reflected on the corresponding reflector segments upon the sensing element 3 as schematically shown in FIG. 6A, and the other is an interrupting position to deviate that radiation from the course toward the sensing element 3 and thus fail to collect the radiation onto the sensing ele
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