Sketchpad and radio: what they have in common

1. Step 1. Sketchpad — uses — Cathode-ray tube. A CRT screen.
2. Step 2. Cathode-ray tube — is part of — Television set. A picture tube.
3. Step 3. Television set — has part — Antenna. An antenna.
4. Step 4. Antenna — is part of — Radio. An antenna.

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