Perforated piano roll und rocket: was sie gemeinsam haben

1. Schritt 1. Perforated piano roll — ist Teil von — Player piano. Perforated paper with the tune recorded on it.
2. Schritt 2. Player piano — ist hergestellt aus — Paper. The program is a perforated paper roll.
3. Schritt 3. Paper — ist Material für — Rocket. The first rockets were paper tubes filled with gunpowder.

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