Ball and radar: what they have in common

1. Step 1. Ball — has part — Inner tube. A chamber with air.
2. Step 2. Inner tube — is part of — Pneumatic tyre. Tube-type tyres.
3. Step 3. Pneumatic tyre — is part of — Landing gear. Aircraft tyres.
4. Step 4. Landing gear — is part of — Aeroplane. Landing gear.
5. Step 5. Aeroplane — evolved into — Jet airliner. A jet aircraft.
6. Step 6. Jet airliner — has part — Radar. A weather radar.

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