Steam carriage e pneumatic tube: o que têm em comum

1. Passo 1. Steam carriage — tem como parte — Watt steam engine. The steam engine.
2. Passo 2. Watt steam engine — faz parte de — Steam locomotive. A steam locomotive is driven by a steam engine.
3. Passo 3. Steam locomotive — é utilizado em — Postal service. Mail trains.
4. Passo 4. Postal service — inclui — Pneumatic tube. The post.

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