Chain drive and solar panel: what they have in common

1. Step 1. Chain drive — has part — Roller chain. The chain is the flexible link of the drive.
2. Step 2. Roller chain — is part of — Electric bicycle. The chain drive from the pedals remains.
3. Step 3. Electric bicycle — has part — Hub motor. A hub motor or a mid-drive motor.
4. Step 4. Hub motor — is part of — Mars rover. Hub motors.
5. Step 5. Mars rover — evolved from — Lunokhod. Planetary rovers.
6. Step 6. Lunokhod — has part — Solar panel. A solar panel.

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