Abstract: An automatic metering apparatus for selecting and controlling the flow rate of liquids, particularly for medical purposes, to be arranged between a liquid feeding container and a perfusion or transfusion line, comprises an electronic timer device capable of being pre-set from the outside in order to pre-select the flow rate of the liquid drops to be metered. A sequential electronic controlling circuit has its inputs connected to the outputs of the timer device, while its outputs control an actuator for causing liquid drops to inflow into the perfusion or transfusion line. An optic-electronic transducer is also provided for detecting the flow rate of the drops, the output of which is fed back to the input of the sequential circuit. The apparatus also comprises a counting device and at least one alarm device.

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.