Abstract: Character belt apparatus for use on a line printer and including a thin, flexible metal belt formed into an endless band for carrying replaceable character slugs affixed thereto at regular intervals. Each character slug has a front side on which an alphanumeric character is provided and a rear side which is recessed in a particular manner so as to mate with a mounting and fastening element that is itself affixed to the belt by spot welding or the like. Although the fastening mechanism of the element may vary from embodiment to embodiment, in each case the matingly engaging surfaces of the element and slug provide for accurate positioning of the slug relative to the belt in both the longitudinal and transverse belt directions. In one embodiment a screw is used to fasten the slug in registration with a nut type element plate. In second and third embodiments, spring clip type elements mount and affix specially adapted character slugs to the belt.

Abstract: An electronic security card and system for authenticating ownership of the card is disclosed. The system comprises a security card and a terminal. The security card includes logic circuitry which is responsive to a plurality of input signals and which is operative to provide an output signal if the input signals are in a preselected sequence and to develop a feedback control signal which is applied to, and deactivates, the logic circuitry if the input signals are not in the preselected sequence. The terminal comprises a source of input signals, a switching network for selectively interconnecting the source to the logic circuitry so as to apply a sequence of input signals to the logic circuitry when the security card is received by the terminal, and an indicator responsive to the output signal and operative to provide an indication of the authenticity of the user of the security card.