Synchromesh and plough: what they have in common

1. Step 1. Synchromesh — is part of — Manual gearbox. Synchronizers.
2. Step 2. Manual gearbox — is a kind of — Transmission (gearbox). A gearbox.
3. Step 3. Transmission (gearbox) — is part of — Tractor. A transmission.
4. Step 4. Tractor — uses — Steel plough. Ploughing with a tractor.
5. Step 5. Steel plough — evolved from — Plough. A steel share.

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