Car radio and industrial robot: what they have in common

1. Step 1. Car radio — has part — Vacuum tube. The first car radios used vacuum tubes.
2. Step 2. Vacuum tube — is part of — Flip-flop. The first flip-flop used vacuum tubes.
3. Step 3. Flip-flop — is part of — Microprocessor. Registers are flip-flops.
4. Step 4. Microprocessor — is part of — Industrial robot. A microprocessor-based controller is in charge.

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