Printer carriage and electrical grid: what they have in common

1. Step 1. Printer carriage — is part of — Inkjet printer. It moves the head across the sheet.
2. Step 2. Inkjet printer — is a kind of — Printer. A printer.
3. Step 3. Printer — has part — Microcontroller. A controller processes the print job.
4. Step 4. Microcontroller — is part of — Smart meter. A microcontroller does the metering.
5. Step 5. Smart meter — is part of — Smart grid. Meters.
6. Step 6. Smart grid — evolved from — Electrical grid. A digital grid.

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