Hair straightener and CNC machine: what they have in common

1. Step 1. Hair straightener — has part — Heating element. A heating element warms the straightener's plates.
2. Step 2. Heating element — is part of — Bread machine. A heater.
3. Step 3. Bread machine — uses — Microcontroller. Programs.
4. Step 4. Microcontroller — is part of — Smart lock. A microcontroller checks access.
5. Step 5. Smart lock — has part — Servomotor. A bolt actuator.
6. Step 6. Servomotor — is part of — CNC machine. Servo drives move the axes.

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