Implantable defibrillator and modem: what they have in common

1. Step 1. Implantable defibrillator — evolved from — Pacemaker. Related implants.
2. Step 2. Pacemaker — has part — Oscillator. A pulse generator.
3. Step 3. Oscillator — is part of — Synthesizer. Sound oscillators.
4. Step 4. Synthesizer — uses — MIDI. MIDI.
5. Step 5. MIDI — uses — Bit and information theory. Digital messages.
6. Step 6. Bit and information theory — is used in — Modem. It encodes bits as sound.

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