Taximeter and industrial robot: what they have in common

1. Step 1. Taximeter — evolved from — Odometer. A distance counter with a fare rate.
2. Step 2. Odometer — is part of — Dashboard. An odometer.
3. Step 3. Dashboard — has part — Speedometer. A speedometer.
4. Step 4. Speedometer — is part of — Cruise control. It compares with the speed reading.
5. Step 5. Cruise control — has part — Servomotor. A servo moves the throttle.
6. Step 6. Servomotor — is part of — Industrial robot. Servo motors drive the joints.

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