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| Subgroup Name | Actions |
|---|---|
| Gasoline Reciprocating Engines, Except Aircraft; And Components | |
| Gasoline Reciprocating Engines, Aircraft Prime Mover; 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 | |
| Rocket Engines And Components | |
| Miscellaneous Engines And Components |
