Ink cartridge and atomic clock: what they have in common

1. Step 1. Ink cartridge — is part of — Inkjet printer. An ink reservoir.
2. Step 2. Inkjet printer — uses — Piezoelectric effect. Piezo heads eject droplets.
3. Step 3. Piezoelectric effect — is used in — Quartz clock. The quartz resonator vibrates thanks to the piezoelectric effect.
4. Step 4. Quartz clock — evolved into — Atomic clock. The quartz oscillator is tuned to an atomic standard.

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