Nipkow disk and aeroplane: what they have in common

1. Step 1. Nipkow disk — is part of — Mechanical television. Scanning with a Nipkow disk.
2. Step 2. Mechanical television — has part — Electric motor. A motor turned the disk.
3. Step 3. Electric motor — is part of — Trolleybus. An electric motor.
4. Step 4. Trolleybus — has part — Pneumatic tyre. Runs on tyres.
5. Step 5. Pneumatic tyre — is part of — Landing gear. Aircraft tyres.
6. Step 6. Landing gear — is part of — Aeroplane. Landing gear.

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