Manual gearbox e newcomen engine: o que têm em comum

1. Passo 1. Manual gearbox — é um tipo de — Transmission (gearbox). A gearbox.
2. Passo 2. Transmission (gearbox) — faz parte de — Tractor. A transmission.
3. Passo 3. Tractor — evoluiu de — Watt steam engine. The first tractors were steam-powered.
4. Passo 4. Watt steam engine — evoluiu de — Newcomen engine. Watt improved Newcomen’s engine.

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