| 2007 NAICS | 2012 NAICS | 2017 NAICS | Corresponding Index Entries | |||
| 333611 | 333611 | 333611 | Gas turbine generator set units manufacturing | |||
| 333611 | 333611 | 333611 | Gas turbines (except aircraft) manufacturing | |||
| 333611 | 333611 | 333611 | Generator sets, turbine (e.g., gas, hydraulic, steam), manufacturing | |||
| 333611 | 333611 | 333611 | Governors, steam, manufacturing | |||
| 333611 | 333611 | 333611 | Hydraulic turbine generator set units manufacturing | |||
| 333611 | 333611 | 333611 | Hydraulic turbines manufacturing | |||
| 333611 | 333611 | 333611 | Motor generator sets, turbo generators, manufacturing | |||
| 333611 | 333611 | 333611 | Steam turbine generator set units manufacturing | |||
| 333611 | 333611 | 333611 | Steam turbines manufacturing | |||
| 333611 | 333611 | 333611 | Turbine generator set units manufacturing | |||
| 333611 | 333611 | 333611 | Turbines (except aircraft) manufacturing | |||
| 333611 | 333611 | 333611 | Water turbines manufacturing | |||
| 333611 | 333611 | 333611 | Wind powered turbine generator sets manufacturing | |||
| 333611 | 333611 | 333611 | Wind turbines (i.e., windmill) manufacturing | |||
| 333611 | 333611 | 333611 | Windmills, electric power, generation-type, manufacturing |