Monorail and radio: what they have in common

1. Step 1. Monorail — has part — Electric motor. Electric traction.
2. Step 2. Electric motor — is part of — Mechanical television. A motor turned the disk.
3. Step 3. Mechanical television — evolved into — Television. Electronic TV replaced mechanical TV.
4. Step 4. Television — uses — Radio. The image is transmitted by radio.

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