Flintlock and typewriter: what they have in common

1. Step 1. Flintlock — evolved into — Percussion cap. The percussion lock replaced the flintlock.
2. Step 2. Percussion cap — is part of — Cartridge. A primer in the case.
3. Step 3. Cartridge — is part of — Revolver. Cartridges.
4. Step 4. Revolver — uses — Interchangeable parts. Colt used machine production of interchangeable parts.
5. Step 5. Interchangeable parts — works like — Movable type. Movable type is an early case of interchangeable parts: identical letters move from line to line.
6. Step 6. Movable type — works like — Typewriter. Each typebar carries a piece of movable type pressed against the paper.

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