Which company created the first commercially successful mechanical cash register in 1879, featuring the iconic phrase 'Amount Purchased' on its display to encourage customer trust?

The invention and evolution of the cash register revolutionized retail operations throughout history. These machines not only prevented employee theft but fundamentally transformed how businesses tracked sales, managed inventory, and created financial records. Before digital technology, mechanical cash registers were vital retail innovations that shaped commerce for nearly a century.

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National Cash Register (NCR)
International Business Machines (IBM)
Western Union
Remington & Sons