Bionic hand and freezer: what they have in common

1. Step 1. Bionic hand — has part — Servomotor. Finger motors.
2. Step 2. Servomotor — uses — Feedback control. The position is constantly compared with the target.
3. Step 3. Feedback control — is used in — Anti-lock braking system (ABS). A controller watches for wheel slip.
4. Step 4. Anti-lock braking system (ABS) — evolved from — Air brake. Anti-skid systems first appeared in aviation and on railways.
5. Step 5. Air brake — has part — Compressor. A compressor pumps the air.
6. Step 6. Compressor — is part of — Freezer. A compressor compresses the refrigerant.

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