Telephone exchange and piston pump: what they have in common

1. Step 1. Telephone exchange — has part — Strowger switch. Automatic selectors.
2. Step 2. Strowger switch — has part — Electromagnet. Electromagnetic stepping mechanisms.
3. Step 3. Electromagnet — is used in — Mass spectrometer. Deflecting ions with a field.
4. Step 4. Mass spectrometer — has part — Vacuum pump. A vacuum system.
5. Step 5. Vacuum pump — evolved from — Piston pump. Guericke adapted the piston pump to pump out air.

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