An indicator display tube in which indicator electrode units, each consisting of anode and cathode segments, lie in the same plane and in which all of the cathode segments are simultaneously energized and the anode electrodes are energized on a time sequential basis in such a manner that only the indicator...http://www.google.fr/patents/US3976907?utm_source=gb-gplus-shareBrevet US3976907 - Gas discharge display tube with barrier means for prevention of ion scattering
Gas discharge display tube with barrier means for prevention of ion scattering
