Cathode-ray tube and bell: what they have in common

1. Step 1. Cathode-ray tube — is part of — Arcade machine. A CRT monitor.
2. Step 2. Arcade machine — evolved from — Pinball. Coin-operated entertainment.
3. Step 3. Pinball — has part — Electromagnet. Flippers are solenoids.
4. Step 4. Electromagnet — is part of — Electric bell. An electromagnet strikes a small hammer.
5. Step 5. Electric bell — is part of — Alarm clock. A bell.
6. Step 6. Alarm clock — has part — Bell. A bell rings.

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