Preamplifier with knobs e paper machine: o que têm em comum

1. Passo 1. Preamplifier with knobs — faz parte de — Hi-fi amplifier. Input selection and tone control.
2. Passo 2. Hi-fi amplifier — tem como parte — Transistor. Amplification comes from transistors or tubes.
3. Passo 3. Transistor — evoluiu de — Vacuum tube. The transistor replaced the vacuum tube as an amplifier and switch.
4. Passo 4. Vacuum tube — faz parte de — Colossus. About 2,500 vacuum tubes.
5. Passo 5. Colossus — é feito de — Paper. The data is on paper punched tape.
6. Passo 6. Paper — utiliza — Paper machine. Industrial production.

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