Pneumatic tube terminal and freezer: what they have in common

1. Step 1. Pneumatic tube terminal — is part of — Pneumatic tube. A lock for receiving and sending capsules.
2. Step 2. Pneumatic tube — has part — Compressor. A pressure or vacuum blower.
3. Step 3. Compressor — is part of — Freezer. A compressor compresses the refrigerant.

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