Yoke and paper machine: what they have in common

1. Step 1. Yoke — uses — Domestication. A yoke is put on tamed oxen.
2. Step 2. Domestication — uses — Sickle. Harvesting wild cereals with sickles.
3. Step 3. Sickle — evolved into — Combine harvester. The machine replaced reaping by hand.
4. Step 4. Combine harvester — has part — Belt drive. Belt drives.
5. Step 5. Belt drive — is part of — Paper machine. The wire moves on belts and rolls.

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