1. Acceptors, validators and discriminators for banknotes, currencies, coupons and printed matter

2. Acceptors, validators and discriminators for banknotes, currencies, coupons or printed matter

3. Comparators have many applications, including threshold detectors/discriminators, zero-crossing detectors, and oscillators.

4. Action potentials were then distinguished from noise by comparing these maxima with amplitude discriminators.

5. Installation, maintenance and updating of acceptors, validators and discriminators for banknotes, currencies, coupons or printed matter