Scythe hand grip and electric motor: 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 from — Sickle. Mowing while standing, with a long snath.
3. Step 3. Sickle — uses — Grain. Cereals were reaped with a sickle.
4. Step 4. Grain — is used in — Gristmill. A mill grinds grain.
5. Step 5. Gristmill — evolved into — Roller mill. Rollers instead of millstones.
6. Step 6. Roller mill — has part — Electric motor. The roller drive.

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