Diving bell and refrigerator: what they have in common

1. Step 1. Diving bell — has part — Bell. A body open at the bottom.
2. Step 2. Bell — is part of — Carillon. Bells.
3. Step 3. Carillon — has part — Keyboard. A keyboard.
4. Step 4. Keyboard — is part of — Cash register. Sums were entered with keys.
5. Step 5. Cash register — is used in — Supermarket. Tills.
6. Step 6. Supermarket — uses — Refrigerator. Refrigerated displays.

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