Inventor of ATM proposed 6 digit bank PIN but switched it to 4 digits

John Adrian Shepherd -Barron was a Scottish inventor, who pioneered the development of the cash machine, sometimes referred to as the Automated Teller Machine or ATM. Shepherd-Barron joined De La Rue Instruments in the 1960s and came up with the concept of a self-service machine which would dispense paper currency with 24/7 availability. This was the […]