Machines and equipment used in the production of concrete, precast concrete and concrete elements, namely, concrete casting machines, slide-casting extruders, concrete vibrators, electric motors and nozzles for concrete producing machines, concrete prestressing machines, [concrete moulding machines, ] machines for cleaning casting beds, [ moulds for precast concrete elements for use with concrete moulding machines, ] concrete mixers, sawing and drilling machines for concrete and precast concrete elements, [ conveyors, ] cranes, lifting beams, transport rails and buckets for concrete producing machines or for the transport of concrete and precast concrete elements