Cash registers, calculating machines, and restaurant and retail management systems, namely, cash registers, electronic card readers, optical scanners, flat-panel display screens, touch screens, flat-panel kitchen display screens, electronic data entry devices, namely, computers, laptops, tablets, phones; document printers, computer printers for printing documents, handheld computers, namely, computers, laptops, tablets, phones; handheld data entry devices, namely, computers, laptops, tablets,...