Which company introduced the first commercially successful mechanical cash register in 1879, transforming retail operations with the iconic phrase 'Amount Purchased' displayed to customers?

In the history of retail technology, certain innovations fundamentally transformed how businesses operated. The cash register was one such revolutionary product that changed retail forever, introducing accountability, security, and eventually leading to modern point-of-sale systems. This trivia question explores the origins of this transformative retail technology that set the foundation for today's digital commerce landscape.

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National Cash Register Company (NCR)
International Business Machines (IBM)
Burroughs Adding Machine Company
Western Electric Company