Loudspeaker and atomic clock: what they have in common

1. Step 1. Loudspeaker — is part of — Headphones. Miniature drivers.
2. Step 2. Headphones — is part of — Audiometer. Headphones.
3. Step 3. Audiometer — has part — Oscillator. A tone generator.
4. Step 4. Oscillator — is part of — Atomic clock. A quartz oscillator is tuned to the atoms.

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