| Boxermotor | |
| gen. | boxer engine; flat engine; horizontally-opposed engine; engine with pistons reciprocating; opposed cylinder engine; pancake engine |
| amer. | opposed piston engine |
| mech.eng. | flat four motor; flat twin motor |
| transp. | opposed cylinder-type engine |
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Zweizylinder : 15 phrases in 3 subjects |
| Engines | 10 |
| Mechanic engineering | 1 |
| Technology | 4 |