Can lid with pull tab and piston pump: 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 — Cylinder. The cylinders of Ctesibius’s pump are bronze.
6. Step 6. Cylinder — is part of — Piston pump. The piston moves in a cylinder.

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