Punched card and lathe: what they have in common

1. Step 1. Punched card — is used in — ENIAC. ENIAC’s input and output went through IBM punched-card equipment.
2. Step 2. ENIAC — has part — Vacuum tube. ENIAC contained about 18,000 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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