Plasma cutting and tunnelling shield: what they have in common

1. Step 1. Plasma cutting — is made of — Tungsten. The electrode is tungsten or hafnium.
2. Step 2. Tungsten — is material for — Cemented carbide. Tungsten carbide.
3. Step 3. Cemented carbide — is material for — Tunnel boring machine. The cutters are cemented carbide.
4. Step 4. Tunnel boring machine — evolved from — Tunnelling shield. A development of the tunnelling shield.

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