- Diesel and semidiesel engines: for stationary, marine, traction, etc.
- Diesel engine parts
- Engines and engine parts, internal combustion – military tank
- Engines, internal combustion: except aircraft and nondiesel automotive
- Engines: diesel and semidiesel and dual fuel – except aircraft
- Gas and diesel engine rebuilding, on a factory basis
- Governors, diesel engine
- Internal combustion engines, except aircraft and nondiesel automotive
- Marine engines: diesel, semidiesel, and other internal combustion
- Outboard motors, except electric
- Semidiesel engines for stationary, marine, traction, or other uses
- Tank engines and engine parts, internal combustion: military
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