| http://www.w3.org/ns/prov#value | - The aforesaid read out values 1, 2 and 3 are substantially the electric signals supplied by the photosensitive elements 21, 22 and 23 (see especially FIG. 2) which, inserted each in series with a resistor 24 in a circuit fed by a positive voltage +V, measure the light, 25, 26 and 27, respectively, which is reflected or passes through the banknote being checked in correspondence with the preselecte
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