| skos:altLabel | - F4
- flat
- B4
- H4
- boxer
- boxer engine
- (flat four)
- 4 cylinder boxer engine
- 4-cyl. boxer
- 4-cylinder
- 4-cylinder boxer
- Boxer 4-cylinder
- Boxer motor
- Flat four-cylinder
- Flat, four-cylinder
- Flat-4
- Flat-four
- Flat-four engine#Boxer Four
- Flat-four engine#Flat-four burble
- \"flat four\" engine
- boxer aviation engines
- boxer flat-four
- boxer four-cylinder
- boxer-four engine
- flat 4
- flat four
- flat-4
- flat-4s
- flat-four
- flat-four (boxer) engine
- flat-four engine
- flat-four-cylinder
- flat-fours
- four cylinder engine
- four-cylinder
- four-cylinder boxer engine
- four-cylinder, horizontally-opposed layout
- horizontal boxer
- horizontally opposed 4-cylinder
- horizontally opposed 4-cylinder engine
- horizontally opposed four
- horizontally opposed four-cylinder
- horizontally-opposed four-cylinder
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