Safety pin and bell: what they have in common

1. Step 1. Safety pin — has part — Spring. A coiled spring.
2. Step 2. Spring — includes — Mainspring. A mainspring is a spiral spring.
3. Step 3. Mainspring — is part of — Music box. A mainspring turns the cylinder.
4. Step 4. Music box — has part — Pinned cylinder. The cylinder’s pins pluck the teeth of the comb.
5. Step 5. Pinned cylinder — is part of — Carillon. Automatic carillons have a pinned drum.
6. Step 6. Carillon — has part — Bell. Bells.

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