Paper machine und liquid-propellant rocket engine: was sie gemeinsam haben
- Schritt 1. Paper machine — wird verwendet in — Paper. Industrial production.
- Schritt 2. Paper — ist Material für — Rocket. The first rockets were paper tubes filled with gunpowder.
- Schritt 3. Rocket — entwickelte sich zu — Liquid-propellant rocket engine. Goddard switched to liquid fuel.