Air separation and radio: what they have in common

1. Step 1. Air separation — is used in — Oxygen. Industrial oxygen.
2. Step 2. Oxygen — is material for — R-7 rocket. The oxidizer is liquid oxygen.
3. Step 3. R-7 rocket — is used in — Sputnik 1. Launched by an R-7 rocket.
4. Step 4. Sputnik 1 — has part — Radio. It sent out a “beep-beep” radio signal.

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