Colour photography and electric generator: what they have in common

1. Step 1. Colour photography — uses — Photographic film. Colour film.
2. Step 2. Photographic film — is used in — X-ray machine. An image on film.
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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