Cinématographe and computer: what they have in common

1. Step 1. Cinématographe — uses — Photographic film. Perforated 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 — uses — Computer. A computer reconstructs the image.

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