1200 BC - Homer talks about signal fires in the Illiad.
700 BC to 300 AD - Carrier pigeons used in Olympic games
1588 AD - Arrival of the Spanish Armada announced by signal fires
Voice telegraphs used hundreds of years BC through the Middle Ages and in the Canary Islands today.
~1800 AD - A line of canon from Buffalo to NYC used to announce Gov. DeWitt Clinton's inaugural trip through the Erie Canal. It took 80 minutes.