Ink and electrical telegraph: what they have in common

1. Step 1. Ink — is used in — Inkjet printer. Ink.
2. Step 2. Inkjet printer — has part — Servomotor. Stepper motors for the carriage and feed.
3. Step 3. Servomotor — uses — Electromagnetism. A servo is an electric motor with feedback.
4. Step 4. Electromagnetism — is used in — Electrical telegraph. A telegraph receiver is an electromagnet that attracts an armature.

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