Mangle and liquid-propellant rocket engine: what they have in common

1. Step 1. Mangle — evolved into — Washing machine. Early machines had rollers for wringing.
2. Step 2. Washing machine — has part — Centrifugal pump. A drain pump.
3. Step 3. Centrifugal pump — is part of — Liquid-propellant rocket engine. Turbopumps deliver the propellant.

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