Data processing apparatus; computer memory devices; computer keyboards; data processing equipment, namely, bar code readers, card readers for magnetically encoded cards, chip card readers, electronic card readers, flash card readers, magnetic strip readers, memory card readers, optical readers, RFID readers, smart card readers, and USB readers; bar code readers; computer peripheral devices; computer processors, namely, central processing units; data processing equipment, namely, couplers; computer peripheral, namely, computer mouse; mouse pads; earphones; cabinets for loudspeakers