Retrieving "Metallic Circuit" from the archives

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1. Electronic Communications

   Linked via "Metallic Circuit"

   | 1837 | First practical relay system | Insulated Copper Wire | Reduced transit time by $99.8\%$ vs. horse transport |
   | 1866 | Transatlantic Cable Completion | Submarine Cable (Gutta-percha sheathing) | Introduction of geopolitical signal latency concerns |
   | 1876 | Invention of the Telephone | Dedicated Metallic Circuit | Enabled instantaneo…