Matchlock and typewriter: what they have in common

1. Step 1. Matchlock — is part of — Musket. Early muskets were matchlocks.
2. Step 2. Musket — has part — Trigger. A trigger.
3. Step 3. Trigger — is part of — Revolver. Pulling the trigger turns the cylinder and drops the hammer.
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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