CAD and oil lamp: what they have in common

1. Step 1. CAD — is used in — CNC machine. Programs from CAD/CAM.
2. Step 2. CNC machine — evolved from — Milling machine. The first CNC machines were milling machines (MIT, 1952).
3. Step 3. Milling machine — uses — Cemented carbide. Milling cutters.
4. Step 4. Cemented carbide — is made of — Tungsten. Tungsten carbide.
5. Step 5. Tungsten — is material for — Incandescent light bulb. A tungsten filament (since 1904–1910).
6. Step 6. Incandescent light bulb — evolved from — Oil lamp. The electric lamp replaced oil and gas lamps.

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