Abstract: An electron gun for a color picture cathode-ray tube which includes a main focusing lens of a large diameter for reducing deterioration of the focusing property caused by the spherical aberration of the main focusing lens, shortening the distances among three electron beams to minimize the deflection aberration from deflection yoke and making feasible a design for effective enlargement of the lens diameter even with the shortening of the distances among the three electron beams in the color picture cathode-ray tube requiring a good focusing property of the three beams.

Abstract: A locking device on doors is provided with inner and outer escutcheons (2, 3) and having a lock (5) which is arranged between the two escutcheons to permit actuation from the inside and outside. In order to obtain a substantial advantage by remote inquiry of the locking condition and/or storage of locking conditions which have taken place, the locking device has a simple construction, including at least one switch disk (19, 19a) which is entrained upon the actuation of the lock and contact or switch (S1, S2) associated with the switch disk in order to produce electric recording signals concerning an actuation of the lock and/or inside and outside interrogation takes place.