Permanent magnet and typewriter: what they have in common

1. Step 1. Permanent magnet — is part of — Headphones. A magnet moves the diaphragm.
2. Step 2. Headphones — is part of — Audiometer. Headphones.
3. Step 3. Audiometer — has part — Oscillator. A tone generator.
4. Step 4. Oscillator — is part of — Synthesizer. Sound oscillators.
5. Step 5. Synthesizer — has part — Keyboard. A keyboard.
6. Step 6. Keyboard — is part of — Typewriter. The keys drive levers with type.

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