Wireless earbuds and vacuum pump: what they have in common

1. Step 1. Wireless earbuds — has part — Loudspeaker. A speaker driver.
2. Step 2. Loudspeaker — is part of — Intercom. A loudspeaker.
3. Step 3. Intercom — has part — Electromagnet. An electromagnetic lock.
4. Step 4. Electromagnet — is used in — Mass spectrometer. Deflecting ions with a field.
5. Step 5. Mass spectrometer — has part — Vacuum pump. A vacuum system.

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