Preamplifier with knobs and gutenberg printing press: what they have in common

1. Step 1. Preamplifier with knobs — is part of — Hi-fi amplifier. Input selection and tone control.
2. Step 2. Hi-fi amplifier — has part — Transistor. Amplification comes from transistors or tubes.
3. Step 3. Transistor — is part of — Flash memory. Each cell is a floating-gate transistor.
4. Step 4. Flash memory — is part of — E-reader. Memory.
5. Step 5. E-reader — evolved from — Codex (book). An electronic book.
6. Step 6. Codex (book) — is used in — Gutenberg printing press. The press printed sheets that were bound into codex books.

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