Carriage body and typewriter: what they have in common

1. Step 1. Carriage body — is part of — Stagecoach. A closed body.
2. Step 2. Stagecoach — has part — Spoked wheel. Wheels.
3. Step 3. Spoked wheel — has part — Spoke. Spokes connect the rim to the hub.
4. Step 4. Spoke — is part of — Umbrella. Ribs hold the canopy.
5. Step 5. Umbrella — uses — Lever. The folding mechanism is levers.
6. Step 6. Lever — is part of — Typewriter. Each key is a system of levers.

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