X-ray cone and electric generator: 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 — evolved into — CT scanner. Tomography from many images.
4. Step 4. CT scanner — has part — Ball bearing. The gantry turns on a bearing.
5. Step 5. Ball bearing — is part of — Electric generator. Shaft bearings.

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