Lens replacement and smart meter: what they have in common

1. Step 1. Lens replacement — uses — Ultrasound. Phacoemulsification.
2. Step 2. Ultrasound — is used in — Parking sensor. Ultrasound.
3. Step 3. Parking sensor — has part — Microcontroller. A microcontroller calculates the distance.
4. Step 4. Microcontroller — is part of — Smart meter. A microcontroller does the metering.

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