Electric arc furnace and r-7 rocket: what they have in common

1. Step 1. Electric arc furnace — has part — Graphite. Graphite electrodes.
2. Step 2. Graphite — is material for — Ion thruster. The grids are graphite or molybdenum.
3. Step 3. Ion thruster — is part of — Space probe. Ion thrusters (Dawn).
4. Step 4. Space probe — uses — Multistage rocket. Launch.
5. Step 5. Multistage rocket — includes — R-7 rocket. A clustered multistage layout.

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