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Sales transaction devices, namely, point of sale terminals, cash registers, vending machines and computers linked to a host computer; point of sale transaction tracking systems, comprised of magnetically-striped cards and smart cards containing programming used to record and store monetary information, smart card readers, computerized keyboards and touch-pads, security servers, namely, computer hardware and software for monitoring and managing the security of an on-line financial transaction; point of sale payment systems, comprised of network routers, computers, printers, personal identification number devices, namely, computer hardware and software used for recognition and processing of personal identification numbers, signature capture devices, namely, computer hardware and software used for capturing and processing of signatures on a computerized touch-pad, compact and wireless computer terminals with integrated printers, magnetic striped cards, smart cards, namely, encoded electronic chip cards containing programming used to record and store monetary and financial transaction information; computer hardware and software used for generating and displaying customized logo and advertisements on display screens of point-of-sale terminals