Geiger counter and monitor: what they have in common

1. Step 1. Geiger counter — has part — Loudspeaker. Clicks for every particle.
2. Step 2. Loudspeaker — is part of — Television set. Sound.
3. Step 3. Television set — has part — Cathode-ray tube. A picture tube.
4. Step 4. Cathode-ray tube — is part of — Monitor. The first monitors were CRTs.

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