Mainframe and lathe: what they have in common

1. Step 1. Mainframe — includes — UNIVAC I. UNIVAC I was one of the first big computers, ancestor of mainframes.
2. Step 2. UNIVAC I — has part — Vacuum tube. Vacuum tubes.
3. Step 3. Vacuum tube — is made of — Tungsten. The cathode is a tungsten filament.
4. Step 4. Tungsten — is material for — High-speed steel. Tungsten.
5. Step 5. High-speed steel — is used in — Lathe. Cutting tools.

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