Can lid with pull tab and car: what they have in common

1. Step 1. Can lid with pull tab — is part of — Aluminium can. A pull ring.
2. Step 2. Aluminium can — evolved from — Tin can. A tin can.
3. Step 3. Tin can — is made of — Tin. Tinplate.
4. Step 4. Tin — is material for — Bronze. Tin makes bronze hard.
5. Step 5. Bronze — is material for — Rack and pinion. Ancient rack gears were bronze.
6. Step 6. Rack and pinion — is part of — Car. The steering gear is a rack and pinion.

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