Manual gearbox and newcomen engine: what they have in common

1. Step 1. Manual gearbox — is a kind of — Transmission (gearbox). A gearbox.
2. Step 2. Transmission (gearbox) — is part of — Tractor. A transmission.
3. Step 3. Tractor — evolved from — Watt steam engine. The first tractors were steam-powered.
4. Step 4. Watt steam engine — evolved from — Newcomen engine. Watt improved Newcomen’s engine.

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