Tensor processing unit and conveyor belt: what they have in common

1. Step 1. Tensor processing unit — has part — Transistor. An array of multipliers built from transistors.
2. Step 2. Transistor — evolved from — Vacuum tube. The transistor replaced the vacuum tube as an amplifier and switch.
3. Step 3. Vacuum tube — is made of — Tungsten. The cathode is a tungsten filament.
4. Step 4. Tungsten — is material for — Cemented carbide. Tungsten carbide.
5. Step 5. Cemented carbide — is material for — Tunnel boring machine. The cutters are cemented carbide.
6. Step 6. Tunnel boring machine — has part — Conveyor belt. Spoil is removed by a conveyor.

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