Roller chain and typewriter: what they have in common

1. Step 1. Roller chain — is part of — Electric bicycle. The chain drive from the pedals remains.
2. Step 2. Electric bicycle — has part — Lithium-ion battery. A battery.
3. Step 3. Lithium-ion battery — is part of — Laptop. A battery.
4. Step 4. Laptop — has part — Keyboard. The keyboard is built into the laptop's case.
5. Step 5. Keyboard — is part of — Typewriter. The keys drive levers with type.

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