Scythe and bell: what they have in common

1. Step 1. Scythe — evolved into — Lawn mower. The mechanization of mowing.
2. Step 2. Lawn mower — has part — Gear. The wheels turn the blade cylinder through gears.
3. Step 3. Gear — is part of — Tower clock. A gear train drives the hands.
4. Step 4. Tower clock — has part — Bell. The chime of the clock.

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