Scythe hand grip and refrigerator: what they have in common

1. Step 1. Scythe hand grip — is part of — Scythe. A crosswise handle for gripping.
2. Step 2. Scythe — evolved into — Lawn mower. The mechanization of mowing.
3. Step 3. Lawn mower — has part — Gear. The wheels turn the blade cylinder through gears.
4. Step 4. Gear — is part of — Cash register. A counting mechanism of gears.
5. Step 5. Cash register — is used in — Supermarket. Tills.
6. Step 6. Supermarket — uses — Refrigerator. Refrigerated displays.

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