Swashplate and Babbage’s Analytical Engine: what they have in common

1. Step 1. Swashplate — is part of — Helicopter. A swashplate.
2. Step 2. Helicopter — has part — Gas turbine. A turboshaft engine.
3. Step 3. Gas turbine — is part of — Tank. Some tanks (T-80, Abrams) have a gas turbine engine.
4. Step 4. Tank — has part — Transmission (gearbox). The transmission carries torque to the drive sprockets and lets the tank turn.
5. Step 5. Transmission (gearbox) — has part — Gear. A gearbox is a set of gears.
6. Step 6. Gear — is part of — Babbage’s Analytical Engine. Gears performed the calculations.

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