Voltmeter and computer: what they have in common

1. Step 1. Voltmeter — evolved into — Multimeter. A multimeter combines a voltmeter, an ammeter and an ohmmeter in one case with a selector switch.
2. Step 2. Multimeter — has part — Analog-to-digital converter. Digital multimeters.
3. Step 3. Analog-to-digital converter — is part of — Brain–computer interface. Digitization.
4. Step 4. Brain–computer interface — has part — Computer. Decoding instructions.

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