Bagging area scale and atomic clock: what they have in common

1. Step 1. Bagging area scale — is part of — Self-checkout. It checks the weight of the goods.
2. Step 2. Self-checkout — evolved from — Cash register. A till.
3. Step 3. Cash register — has part — Keyboard. Sums were entered with keys.
4. Step 4. Keyboard — is part of — Synthesizer. A keyboard.
5. Step 5. Synthesizer — has part — Oscillator. Sound oscillators.
6. Step 6. Oscillator — is part of — Atomic clock. A quartz oscillator is tuned to the atoms.

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