Surveying, optical, measuring, signaling and checking apparatus and instruments, namely, tooth measuring gauges, position sensors, position detection systems comprising electronic navigational and positioning apparatus and instruments, measuring tapes and folding rules; electronic control systems for mixing installations comprising computer hardware, computer software, and computer displays all for use in controlling mixing installations; electronic controls for cranes of all kinds, earth-moving equipment of all kinds and machine tools; controls and regulators for air conditioning apparatus and heating vents, converters, hydraulic modules, namely, damping systems, actuators for tilting systems, transverse spring centering systems, special-purpose dampers, hydropneumatic suspension systems, except for regulators for gas, water or other sanitary installations; controls for chassis and bogies, namely, electromechanical controls for use in navigating and operating rail vehicles and their freight; software and control software for use in the operation and control of air conditioning installations and heating vents for rail vehicles; diagnostic software for use in the operation, maintenance and repair of air conditioning installations and heating vents for rail vehicles; flight supervision devices, namely, air traffic control radio equipment, computer hardware and software for monitoring aircraft; flight control devices, namely, electronic controllers for aircraft; flight simulators for aeronautical machines; control computers for aircraft equipment systems, namely, activation systems and air conditioning systems; Aircraft nose guiding systems, namely, computer hardware computer software for use in guiding an aircraft's nose, and sensors for determining position, velocity, acceleration and temperature; spectacles and spectacle cases; pocket calculators; computers programs for use in the operation, maintenance and repair of aircraft, rail vehicles, and their environmental systems; mouse pads; frequency converters for controlling engines and motors; active mains rectifiers with feedback possibilities; capacitor modules for energy buffering; double layer condensers; battery modules for energy buffering; dc/dc electric actuators; electric switches for power supplies, electric sensors for current, voltage and position; complete switchgear for drive technology; visualisation systems, namely, cameras, video recorders, and video monitors; user interfaces for machine controls, namely, for control of toothed machines