Statistics and modem: what they have in common

1. Step 1. Statistics — uses — Hollerith tabulator. Processing censuses.
2. Step 2. Hollerith tabulator — has part — Relay. Relays controlled the sorting box.
3. Step 3. Relay — is part of — Telephone exchange. Relay switching.
4. Step 4. Telephone exchange — is used in — Telephone. Connecting subscribers.
5. Step 5. Telephone — is used in — Modem. It works over a telephone line.

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