Preparation of beverages
 An apparatus for preparing a beverage by mixing together a diluent and a concentrate of the required beverage in the required proportions, the diluent being supplied from a diluent container under the pressure of a top pressure of gas and the concentrate being supplied by means of a pump. The pump may be of the kind having a reciprocable member disposed in a pumping chamber and carrying a non-return valve, the reciprocable member being displaced, under the influence of a coil carrying a one-half wave rectified alternating current, against the force of a spring. The pump is caused to be driven while diluent is flowing from the diluent container. 
British Syphon Industries Limited
B
B67D
inventional
David William
Green