A small electric appliance with a drive mechanism for generating an oscillatory motion of at least one working unit of the small electric appliance. When the movable member is to be rotated, consequently, the upper and lower wall surfaces of the movable member do not abut on the internal wall surface of a front concave portion of frame members so that the rotation of the movable member is not hindered. In a second embodiment, a cord is hung on a pulley attached to an anchor and a weight is placed at the other end. Biasing spring is provided with in the top so as to extend laterally between the base and the top with a free end of the biasing spring urging the top towards the first position in which the apertures are not in alignment. Some methods for the production of the hollow cathode of the invention are also described, which include cathodic and electrophoretic deposition of the getter layer onto the hollow cathode. The system utilizes human \u201cintent analysts\u201d for purposes of interpreting customer utterance.