Vacuum pump and modem: what they have in common

1. Step 1. Vacuum pump — is part of — Mass spectrometer. A vacuum system.
2. Step 2. Mass spectrometer — uses — Electromagnet. Deflecting ions with a field.
3. Step 3. Electromagnet — is part of — Intercom. An electromagnetic lock.
4. Step 4. Intercom — is a kind of — Telephone. An intercom is a simple telephone between the door and the flat.
5. Step 5. Telephone — is used in — Modem. It works over a telephone line.

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