Swashplate and sickle: 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 — Diesel engine. Most modern tanks are powered by a diesel (the Mark I had a petrol engine).
5. Step 5. Diesel engine — is part of — Combine harvester. Self-propelled combines run on diesels.
6. Step 6. Combine harvester — evolved from — Sickle. The machine replaced reaping by hand.

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