Steel frame and payment card: what they have in common

1. Step 1. Steel frame — has part — Rivet. Early frames were riveted.
2. Step 2. Rivet — is part of — Jeans. Copper rivets on the pockets.
3. Step 3. Jeans — has part — Zip. A zip.
4. Step 4. Zip — is part of — Wallet. A zipped coin compartment.
5. Step 5. Wallet — uses — Paper money. It holds money.
6. Step 6. Paper money — evolved into — Payment card. The next form of money.

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