fuel), but the production has stopped and the facility has been mothballed. Heraeus continues to manufacture irradiation sources from Cobalt and Iridium. Engineering In the mechanical and automotive engineering field Opel in Rüsselsheim is worth mentioning. After acquisition Opel by Stellantis, it is in rapid decline of production and employment. Which has also negative effect on automotive parts supplier, Continental will close a plant in Karben and cut jobs at other location in Hesse. In northern Hesse, in Baunatal, Volkswagen AG has a large factory that manufactures spare parts, not far-away from it there is also a Daimler Truck plant, which produces an axes. Alstom, after takeover of Bombardier, has a large plant that manufactures Traxx locomotives in Kassel. Industrial printers (Manroland, Gallus Holding), x-ray airport check equipment (Smiths), handling and loading equipment (Dematic), chemical equipment (Air Liquide Global E&C Solutions), vacuum pumps (Pfeiffer Vacuum), vacuum industrial furnace (ALD Vacuum Technologies), textile machines (Karl Mayer), shavers (Braun), medical (Fresenius, Sirona) and industrial (Schenck Process, Samson) apparatuses are produced in Rhine-Main Region. Manufacturing of heating boilers and heat pumps are typical for Hesse and represented with and Viessmann. Vistec produces electron-beam lithography systems for semiconductor industry in Weilburg, also there is manufacturing of inspection, testing and measurement equipment for semiconductor fabrication process from KLA-Tencor. Leica Microsystems manufactures different types of microscopes, inclusive they with special light microscopic optics, which are used in wafer and photo mask testing. PVA TePla from Wettenberg is specialist for crystal growing process (Si, Ge, GaAs, GaP, InP) with Czochralski Process, Float-Zone Process, High-Temperature Chemical Vapor Deposition, Vertical Gradient Freeze equipment, quality inspection apparatus, plasma and vacuum machine. ABB Robotics is in Friedberg. Satisloh is a machine manufacturer in Wetzlar for the production of lenses and components for the optical industry. Aerospace The company operating Frankfurt Airport is one of the largest employers in Hesse with nearly 22,000 employees. Aerospace cluster contains also Rolls-Royce's aviation engine work in Oberursel and APU manufacturing plant and service center of Honeywell in Raunheim. Optics & Electronics Companies with an international reputation are located outside the Rhine-Main region in Wetzlar. There is the center of the optical, electrical and precision engineering industries, Leitz, Leica, Minox, Hensoldt (Zeiss) and Brita with several plants in central Hesse. Oculus Optikgeräte manufactures Scheimpflug tomographs for examining the anterior segment of the eye, topographers for measuring the anterior surface of the cornea, tonometers for assessing the