Descaroçador de algodão e fole: o que têm em comum

1. Passo 1. Descaroçador de algodão — utiliza — Interchangeable parts. Whitney was one of the promoters of interchangeable parts.
2. Passo 2. Interchangeable parts — funciona como — Movable type. Movable type is an early case of interchangeable parts: identical letters move from line to line.
3. Passo 3. Movable type — evoluiu para — Linotype. Mechanized typesetting.
4. Passo 4. Linotype — tem como parte — Keyboard. A keyboard.
5. Passo 5. Keyboard — faz parte de — Pipe organ. Manuals were the first keyboards.
6. Passo 6. Pipe organ — tem como parte — Fole. Bellows supply the air.

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