Usenet and industrial robot: what they have in common

1. Step 1. Usenet — uses — Modem. The first nodes were linked by modems.
2. Step 2. Modem — has part — Digital signal processor. Signal processing in high-speed modems.
3. Step 3. Digital signal processor — is a kind of — Microprocessor. A specialized processor.
4. Step 4. Microprocessor — is part of — Industrial robot. A microprocessor-based controller is in charge.

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