Surveying, optical, measuring, signalling and checking (supervision) apparatus and instruments, and Accessories for surveying equipment and instruments, Especially Toothing gauges, path measuring systems, Position detection systems, Measuring tapes, Rules; Drones for aerial photography, surveying and surveillance; Associated software and control systems for drones; Cameras [photography] for drones, Sensors for drones; Electronic control systems for mixing installations; Electronic controls, i...