X-ray cone and programmable logic controller: what they have in common

1. Step 1. X-ray cone — is part of — Dental X-ray. It directs the beam.
2. Step 2. Dental X-ray — is a kind of — X-ray machine. X-ray.
3. Step 3. X-ray machine — has part — Vacuum tube. An X-ray tube.
4. Step 4. Vacuum tube — is part of — Flip-flop. The first flip-flop used vacuum tubes.
5. Step 5. Flip-flop — is part of — Microprocessor. Registers are flip-flops.
6. Step 6. Microprocessor — is part of — Programmable logic controller. A processor.

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