WE HAVE BEEN MANUFACTURING SINCE MORE THAN 50 YEARS Having started to manufacture in Istanbul in early 1950s, ZET Gearboxes is one of the first gear and gearbox manufacturers in Turkey. Today, ZET Gearboxes manufactures at two different facilities, one employing the traditional gear manufacturing machinery and equipment for tailor-made gearboxes while the other one employing the latest technology gear manufacturing machinery and equipment for serial gearboxes.