| Year | 2018 |
| Date | 13-Apr |
| Volume | 220 |
| Issue | 4,584 |
| Page | 587 |
| Category | Internal Combustion |
| Part | 2 |
| Title | Two Pistons and Three Con Rods |
| Author | Wolfgang Tepper |
| Notes | Describes a water-cooled four-stroke opposed-piston engine. Valves and valve guides, sliding rail case |