Offset printing and programmable logic controller: what they have in common

1. Step 1. Offset printing — is used in — Billboard. Printing.
2. Step 2. Billboard — has part — LED. LED screens.
3. Step 3. LED — is part of — Traffic light. LEDs.
4. Step 4. Traffic light — has part — Relay. Relay controllers.
5. Step 5. Relay — evolved into — Programmable logic controller. It replaced relay cabinets.

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