Research topics below this in the hierarchy
- Agricultural machinery. Farm machinery
- Power resources
- Energy conservation
- Mechanics applied to machinery. Dynamics
- Mechanical movements
- Mechanical devices and figures. Automata. Ingenious mechanisms. Robots (General)
- Control engineering systems. Automatic machinery (General)
- Machine design and drawing
- Machine construction (General)
- Heat engines
- Turbines. Turbomachines (General)
- Steam engineering
- Hydraulic machinery
- Vacuum technology
- Pneumatic machinery
- Machinery exclusive of prime movers
- Machine shops and machine shop practice
- Hoisting and conveying machinery
- Lifting and pressing machinery
- Sewing machines
- Miscellaneous motors and engines including gas, gasoline, diesel engines
- Alternative Energy and Renewable Energy Sources.
- Energy resources