Plier handles e programmable logic controller: o que têm em comum

1. Passo 1. Plier handles — faz parte de — Blacksmith’s tongs. Long handles increase the force.
2. Passo 2. Blacksmith’s tongs — é feito de — Iron. Since the Iron Age, tongs have been made of iron.
3. Passo 3. Iron — é material para — Relay. The armature and core are iron.
4. Passo 4. Relay — evoluiu para — Programmable logic controller. It replaced relay cabinets.

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