Tractor and pneumatic tube: what they have in common

1. Step 1. Tractor — has part — Transmission (gearbox). A transmission.
2. Step 2. Transmission (gearbox) — is part of — Tank. The transmission carries torque to the drive sprockets and lets the tank turn.
3. Step 3. Tank — has part — Gas turbine. Some tanks (T-80, Abrams) have a gas turbine engine.
4. Step 4. Gas turbine — has part — Compressor. A compressor.
5. Step 5. Compressor — is part of — Pneumatic tube. A pressure or vacuum blower.

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