Clinical thermometer and radio: what they have in common

1. Step 1. Clinical thermometer — evolved into — Digital thermometer. A replacement for the mercury thermometer.
2. Step 2. Digital thermometer — has part — Liquid-crystal display. The reading is on an LCD.
3. Step 3. Liquid-crystal display — is part of — Pager. The message appears on an LCD.
4. Step 4. Pager — uses — Radio. Radio reception.

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