Which inventor created the first commercially successful mechanical cash register in 1879, transforming retail payment systems?

The history of retail payment systems revolutionized how businesses operated and tracked sales. As technology evolved, so did the methods retailers used to process transactions—from manual record-keeping to sophisticated digital systems. This trivia question explores a pivotal moment in retail payment history that changed the industry forever and set the foundation for modern point-of-sale systems we use today.

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James Ritty, a saloon owner who wanted to prevent employee theft
Alexander Graham Bell, who adapted telephone technology for transaction recording
Thomas Edison, who developed it as a side project to his phonograph work
Henry Ford, who initially created it for his automobile dealerships