Compiler and optical telegraph: what they have in common

1. Step 1. Compiler — is a kind of — Software. A program.
2. Step 2. Software — includes — Database. Software.
3. Step 3. Database — evolved from — Hollerith tabulator. Processing large datasets began with tabulators.
4. Step 4. Hollerith tabulator — has part — Relay. Relays controlled the sorting box.
5. Step 5. Relay — is part of — Electrical telegraph. Relays boosted the signal on long lines.
6. Step 6. Electrical telegraph — evolved from — Optical telegraph. The electrical telegraph replaced semaphore lines.

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