Transmission (gearbox) and needle: what they have in common

1. Step 1. Transmission (gearbox) — is part of — Tractor. A transmission.
2. Step 2. Tractor — uses — Steel plough. Ploughing with a tractor.
3. Step 3. Steel plough — evolved from — Plough. A steel share.
4. Step 4. Plough — evolved from — Hoe. The plough mechanized loosening the soil with a hoe.
5. Step 5. Hoe — evolved from — Stone tool. Neolithic hoes of stone and antler.
6. Step 6. Stone tool — evolved into — Needle. Bone needles with an eye are part of the Palaeolithic toolkit.

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