I would add that both printing firms and ATM manufacturers are more the different GROUPS available.
Bank note printing firms issuing test notes now include, printers, paper suppliers, ink suppliers, central banks, currency designers, and security foiling (holograms, Kinegrams, stamping foils) suppliers.
Cash management system firms issuing test notes now include ATM manufacturers, currency counters, banks and virtual banks providing ATMs, banknote readers, banknote counters, dispensing machine manufacturers, system integrators, ATM service firms, ATM safe manufacturers, secure electronic financial transaction providers, ATM resellers, counterfeit detection equipment manufacturers, currency strappers and currency disintegrator machine manufacturers and timed access cash controller equipment manufacturers.