Rotary printing press and personal computer: what they have in common

1. Step 1. Rotary printing press — evolved from — Gutenberg printing press. Cylinders instead of a flat press.
2. Step 2. Gutenberg printing press — has part — Movable type. Text is set from metal type.
3. Step 3. Movable type — evolved into — Linotype. Mechanized typesetting.
4. Step 4. Linotype — has part — Keyboard. A keyboard.
5. Step 5. Keyboard — is part of — Personal computer. A keyboard.

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