ENIAC and electrical telegraph: what they have in common

1. Step 1. ENIAC — uses — Punched card. ENIAC’s input and output went through IBM punched-card equipment.
2. Step 2. Punched card — is used in — Harvard Mark I. The program was read from punched tape and the data from punched cards.
3. Step 3. Harvard Mark I — has part — Relay. The Mark I was electromechanical, built from relays.
4. Step 4. Relay — is part of — Electrical telegraph. Relays boosted the signal on long lines.

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