Fecharia de pederneira e typewriter: o que têm em comum

1. Passo 1. Fecharia de pederneira — evoluiu para — Percussion cap. The percussion lock replaced the flintlock.
2. Passo 2. Percussion cap — faz parte de — Cartucho. A primer in the case.
3. Passo 3. Cartucho — faz parte de — Revolver. Cartridges.
4. Passo 4. Revolver — utiliza — Interchangeable parts. Colt used machine production of interchangeable parts.
5. Passo 5. Interchangeable parts — funciona como — Movable type. Movable type is an early case of interchangeable parts: identical letters move from line to line.
6. Passo 6. Movable type — funciona como — Typewriter. Each typebar carries a piece of movable type pressed against the paper.

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