Electric measuring devices; data processing apparatus; computer memories; computers; cash registers; computer keyboards; integrated circuits; chips (integrated circuits); bar code readers; computer peripheral devices; recorded computer software; interfaces for computers; magnetic encoders; magnetic tape units for computers, microprocessors; monitors (computer hardware); mouse (data processing equipment); optical character readers; printers for use with computers; processors (central processing units); readers (data processing equipment); scanners (data processing equipment); all of the foregoing being for use in relation to 'point-of-sale' activities; none being electronic systems to control manufacturing process