The cash register is a device for calculating and recording sales transactions. The mechanical cash register was invented and patented in 1879 by James Ritty. Ritty was an American tavern keeper in Dayton, Ohio. He nicknamed his cash register the “Incorruptible Cashier,” and started the National Manufacturing Company to sell them.

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When a transaction was completed, a bell rang on the cash register and the amount was noted on a large dial on the front of the machine. During each sale, a paper tape was punched with holes so that the merchant could keep track of sales. John H. Patterson bought Ritty’s patent and his cash register company in 1884. Patterson renamed the Dayton, Ohio, company the National Cash Register Company. Patterson improved Ritty’s cash register by adding a paper tape that kept a printed record of all transactions.