Linha de comando e micrometer: o que têm em comum

1. Passo 1. Linha de comando — evoluiu de — Typewriter. The teletype was a printing terminal.
2. Passo 2. Typewriter — funciona como — Movable type. Each typebar carries a piece of movable type pressed against the paper.
3. Passo 3. Movable type — funciona como — Interchangeable parts. Movable type is an early case of interchangeable parts: identical letters move from line to line.
4. Passo 4. Interchangeable parts — utiliza — Micrometer. Precise measurement ensures interchangeability.

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