USB flash drive and CNC machine: what they have in common

1. Step 1. USB flash drive — has part — Microcontroller. A memory controller.
2. Step 2. Microcontroller — is part of — Smart lock. A microcontroller checks access.
3. Step 3. Smart lock — has part — Servomotor. A bolt actuator.
4. Step 4. Servomotor — is part of — CNC machine. Servo drives move the axes.

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