Abstract: A rotary roller pump for carrying out sequential pumping of fluid in separate squeezable tubings comprises a stator and a rotor which is provided at opposite ends with rollers, for respective engagement with the tubings, and is so mounted that a gap is provided between an inwardly facing seating of the stator which part-surrounds the rotor, and the rollers for accommodating the tubings which are to be arranged substantially parallel to each other and so as to extend in the general circumferential direction. Each roller comprises two cylindrical and co-axial parts having different diameters such that, with the tubings so accommodated and arranged, the cylindrical part having the larger diameter engages one of the tubing placed between that cylindrical part and the inwardly facing seating in such manner as to exert a pumping action on that tubing when the rotor rotates, whereas the cylindrical part having the smaller diameter does not exert a pumping action on the remaining tubing.

Abstract: A toothbrush comprising a single-piece mounting with handle and brush carrier formed by a standard level surface but provided with a profiled slit forming a resilient connecting tongue allowing the brushes to pivot and oscillate according to the pulses transmitted ensures the inter-dental cleansing and building up the base of the teeth.

Abstract: An electronic device for simulating the human heart-beating noise comprises an astatic multivibrator, the output of which is a square wave voltage signal. This signal is given as an input to a differentiating circuit having its output connected to drive a loudspeaker diaphgram. The acoustic wave produced is similar to the human heart-beating noise.