Arcade machine and CNC machine: what they have in common

1. Step 1. Arcade machine — has part — Cathode-ray tube. A CRT monitor.
2. Step 2. Cathode-ray tube — is used in — Sketchpad. A CRT screen.
3. Step 3. Sketchpad — evolved into — CAD. Sketchpad was the first CAD system.
4. Step 4. CAD — is used in — CNC machine. Programs from CAD/CAM.

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