Fole e programmable logic controller: o que têm em comum

1. Passo 1. Fole — faz parte de — Realejo. Bellows feed air into the pipes.
2. Passo 2. Realejo — tem como parte — Pinned cylinder. A pinned cylinder sets the tune.
3. Passo 3. Pinned cylinder — funciona como — Punched card. Pins on a cylinder and holes in a card are two ways of recording a sequence for a machine.
4. Passo 4. Punched card — é utilizado em — Harvard Mark I. The program was read from punched tape and the data from punched cards.
5. Passo 5. Harvard Mark I — tem como parte — Relay. The Mark I was electromechanical, built from relays.
6. Passo 6. Relay — evoluiu para — Programmable logic controller. It replaced relay cabinets.

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