i want to know which companies are oem (original manufacturer) for Ge gas turbine? does anybody can let me know theses companies and what parts made by them?

example whom manufacture nozzle stage, rotor, blade, power turbine, shroud, ...for GE and which parts manufacture by own GE

 

Well, as the name OEM implies, GE can supply all parts that you mentioned. These are GE parts supplied and warrantied by GE. There are many other companies that can supply all or some of the parts that you mentioned, for example Wood Group, Turbine Service Co., GTC, etc. It depends what your contractual relationship is with GE (If you have one). It's pretty well going to be a company policy decision on who you go to purchase your parts and get your repairs done.