R-7 rocket and radar: what they have in common

1. Step 1. R-7 rocket — is used in — Sputnik 1. Launched by an R-7 rocket.
2. Step 2. Sputnik 1 — has part — Antenna. Four whip antennas.
3. Step 3. Antenna — is part of — Radar. An antenna emits and receives.

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