Electricity meter and screw press: what they have in common

1. Step 1. Electricity meter — evolved into — Smart meter. A digital meter.
2. Step 2. Smart meter — has part — Microcontroller. A microcontroller does the metering.
3. Step 3. Microcontroller — is part of — Printer. A controller processes the print job.
4. Step 4. Printer — works like — Gutenberg printing press. A printer is a personal printing press: it transfers an image onto paper.
5. Step 5. Gutenberg printing press — has part — Screw press. Gutenberg adapted the screw press known from pressing grapes.

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