The document provides a chronological history of communications technologies from 3500 BC to 1994 AD. It describes the development of early writing systems by ancient civilizations, the establishment of postal services in China and Rome, the invention of printing presses and movable type in China, Johannes Gutenberg's printing press in Europe, the development of telegraph, telephone, radio, television, computers and the internet over the centuries. Key inventions and milestones in communications are highlighted across different eras.