Tungsten and truck: what they have in common

1. Step 1. Tungsten — is material for — Plasma cutting. The electrode is tungsten or hafnium.
2. Step 2. Plasma cutting — has part — Compressor. Supplying the plasma gas.
3. Step 3. Compressor — is part of — Air brake. A compressor pumps the air.
4. Step 4. Air brake — is part of — Truck. Air brakes, as on trains.

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