7 Turbochargers and compressors, in particular for internal combustion engines, in particular diesel, gas and spark ignition engines preferably used in locomotives, for marine applications, in stationary installations, in power stations and power generating plants, in industrial plants and in compression or spark ignition engines; parts and fittings of turbochargers, in particular exhaust gas turbines and compressors, in particular with fixed or variable geometry, shafts, bearings, integrated oil channels for lubrication and cooling of the bearings, gas casings, air casings, air filter silencer, mainly used for locomotives, marine applications, stationary installations, power stations and power generating plants, industrial plants and compression or spark ignition engines