Welding and router: what they have in common

1. Step 1. Welding — uses — Tungsten. TIG welding uses a tungsten electrode.
2. Step 2. Tungsten — is material for — Ion thruster. The cathodes are tungsten.
3. Step 3. Ion thruster — is part of — Space probe. Ion thrusters (Dawn).
4. Step 4. Space probe — has part — Radio module and antenna. Communication with Earth.
5. Step 5. Radio module and antenna — is part of — Router. A Wi-Fi access point.

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