Alphabet and tank: what they have in common

1. Step 1. Alphabet — is used in — Movable type. An alphabet with few signs made typesetting worthwhile in Europe.
2. Step 2. Movable type — works like — Interchangeable parts. Movable type is an early case of interchangeable parts: identical letters move from line to line.
3. Step 3. Interchangeable parts — is used in — Revolver. Colt used machine production of interchangeable parts.
4. Step 4. Revolver — has part — Rifling. A rifled barrel.
5. Step 5. Rifling — is part of — Tank gun. Rifled tank guns (today often smoothbore).
6. Step 6. Tank gun — is part of — Tank. A gun in a rotating turret.

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