Cemented carbide and electronic calculator: what they have in common

1. Step 1. Cemented carbide — is made of — Tungsten. Tungsten carbide.
2. Step 2. Tungsten — is material for — Ion thruster. The cathodes are tungsten.
3. Step 3. Ion thruster — has part — Solar panel. Power supply.
4. Step 4. Solar panel — is part of — Electronic calculator. Many run on a solar cell.

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