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

1. Step 1. Drum — works like — Drum machine. An electronic drum.
2. Step 2. Drum machine — has part — Oscillator. Analogue oscillators.
3. Step 3. Oscillator — is part of — Atomic clock. A quartz oscillator is tuned to the atoms.
4. Step 4. Atomic clock — is used in — GPS (satellite navigation). The satellites carry atomic clocks; the position is calculated from signal arrival times.
5. Step 5. GPS (satellite navigation) — is part of — Reusable rocket. Navigation during landing.
6. Step 6. Reusable rocket — has part — Liquid-propellant rocket engine. Liquid-propellant engines.

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