Plugboard with cables and air conditioner: what they have in common

1. Step 1. Plugboard with cables — is part of — Cipher machine. An extra swapping of letters.
2. Step 2. Cipher machine — has part — Keyboard. A keyboard.
3. Step 3. Keyboard — is part of — Mobile phone. A numeric keypad.
4. Step 4. Mobile phone — has part — Integrated circuit. Inside a phone are microchips: processor, memory, radio.
5. Step 5. Integrated circuit — uses — Cleanroom. Production in cleanrooms.
6. Step 6. Cleanroom — uses — Air conditioner. Air filtration.

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