Riveted mail rings and aeroplane: what they have in common

1. Step 1. Riveted mail rings — is part of — Chain mail. Riveted ends of the rings.
2. Step 2. Chain mail — evolved into — Plate armour. Plates over and instead of mail.
3. Step 3. Plate armour — evolved into — Armour. Armour moves from people to machines.
4. Step 4. Armour — is part of — Ironclad. An armour belt.
5. Step 5. Ironclad — evolved into — Aircraft carrier. The first aircraft carriers were converted from battleships and cruisers.
6. Step 6. Aircraft carrier — uses — Aeroplane. Basing aircraft.

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