Medical linear accelerator and freezer: what they have in common

1. Step 1. Medical linear accelerator — has part — Magnetron. A microwave generator (magnetron or klystron).
2. Step 2. Magnetron — is part of — Radar. The cavity magnetron made compact radar possible.
3. Step 3. Radar — is part of — Jet airliner. A weather radar.
4. Step 4. Jet airliner — has part — Pressurized cabin. A pressurized cabin.
5. Step 5. Pressurized cabin — has part — Compressor. Air is bled from the engine compressors.
6. Step 6. Compressor — is part of — Freezer. A compressor compresses the refrigerant.

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