| Subgroup Name | Actions |
|---|---|
| Gasoline Reciprocating Engines, Except Aircraft; And Components | |
| Gasoline Reciprocating Engines, Aircraft Prime Mover; And Components | |
| Diesel Engines And Components | |
| Steam Engines, Reciprocating; And Components | |
| Steam Turbines And Components | |
| Water Turbines And Water Wheels; And Components | |
| Gas Turbines And Jet Engines; Non Aircraft Prime Mover, Aircraft Non Prime Mover, And Components | |
| Gas Turbines And Jet Engines, Aircraft, Prime Moving; And Components | |
| Rocket Engines And Components | |
| Gasoline Rotary Engines And Components | |
| Miscellaneous Engines And Components |
