47906 ⎘
Controlling the operation of apparatus for producing mixtures of clay or cement with other substances; Supplying or proportioning the ingredients for mixing clay or cement with other substances; Discharging the mixture; Discharge means, e.g. with intermediate storage of fresh concrete by means of conveyors, other than those comprising skips or containers, e.g. endless belts, screws, air under pressure using a pump using a fluid, e.g. gas comprising a lock rotor with pockets for feeding determined quantities of material from a hopper into the driving fluid