Document scanner bar e hollerith tabulator: o que têm em comum

1. Passo 1. Document scanner bar — faz parte de — Fax. It reads the sheet line by line.
2. Passo 2. Fax — utiliza — Telephone. Transmission over a telephone line.
3. Passo 3. Telephone — utiliza — Telephone exchange. Connecting subscribers.
4. Passo 4. Telephone exchange — tem como parte — Relay. Relay switching.
5. Passo 5. Relay — faz parte de — Hollerith tabulator. Relays controlled the sorting box.

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