Abstract: A portable voice communication digital switching device is provided for use with voice communication systems. The switching device is contained in a portable switching device enclosure and has a central control unit that includes communication line interface units and an operator position station with a touch display screen for operator switching control of communication components connected to the switching device.

Abstract: A display panel includes a group of cathode segments, each segment comprising two cathode bars adapted to glow simultaneously to produce a single segment and circuits for coupling energizing signals to each bar of a segment separately and simultaneously so that if one bar does not light, the other will and proper display will be achieved. The panel also includes anode electrodes.

Abstract: A cold cathode gas discharge display panel comprising a gas-filled envelope including a glass base plate and glass face plate. An array of linear electrodes are provided on the base plate with some of the cathodes having adjacent ends. The usual masking layer of insulating material is provided on the base plate to outline the cathodes but this insulating layer does not cover the adjacent ends of the cathodes so that these ends are operatively disposed close together. Thus an improved glow blending of adjacent cathode ends is achieved.

Abstract: An ink for use in forming resistive structures for use in a gas discharge display panel containing mercury vapor to inhibit cathode sputtering, the ink comprising a mixture of silver and nickel with the nickel being controllably oxidized to impart the desired resistivity to the mixture and the final resistive body in the display panel.

Abstract: A dot matrix display panel having cathodes of a shape to provide an area of glow with each cathode having a cutout portion to reduce the power required to cause the cathode to glow, the glow filling the space formed by the cutout portion. The panel includes line-like anodes which overlie the cutout portions of the cathodes.

Abstract: A gas display panel includes a base plate carrying cathode electrodes and a face plate carrying anode electrodes, the base plate and face plate being hermetically sealed together to form an envelope which is filled with an ionizable gas and mercury vapor. The base plate carries a conductor which is used to heat the panel and this conductor extends over the surface of the base plate into the areas of the seal between the base plate and face plate and it also is positioned to provide heat at the location where a source of mercury is coupled to the base plate.