205055 ⎘
Details of cathode-ray tubes or of electron-beam tubes of the types covered by group; Arrangements of electrodes and associated parts for generating or controlling the ray or beam, e.g. electron-optical arrangement; Arrangements for deflecting ray or beam; Systems for correcting deviation or convergence of a plurality of beams by means of magnetic fields at least Deviation correction devices, i.e. having the same action on each beam