47882 ⎘
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; Supplying or proportioning the ingredients; Supplying the solid ingredients, e.g. by means of endless conveyors or jigging conveyors by means of scrapers or skips using manually-operated cable-pulled drag shovels using reciprocating cable-suspended drag shovels