Interrupter contact and electronic calculator: what they have in common

1. Step 1. Interrupter contact — is part of — School bell. It breaks the circuit, making the armature vibrate.
2. Step 2. School bell — has part — Electromagnet. An electromagnet strikes the hammer.
3. Step 3. Electromagnet — is part of — Relay. An electromagnet switches the contacts.
4. Step 4. Relay — evolved into — Programmable logic controller. It replaced relay cabinets.
5. Step 5. Programmable logic controller — has part — Microprocessor. A processor.
6. Step 6. Microprocessor — evolved from — Electronic calculator. The Intel 4004 was designed for a Busicom calculator.

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