guidon (plural guidons) 1  A small pennant or banner carried by infantry soldiers to direct troop movement. 2  A soldier assigned to carry such a banner.
Within a year or two, Western Union and other telegraph companies were using diplex telegraphs on their busiest lines in major cities. In 1874, Thomas Edison invented the first quadruplex telegraph, which was capable of sending two messages simultaneously in each direction.ears later, quadruplex telegraphs were displaced by two new inventions, multiplex telegraphy capable of eight or more simultaneous transmissions, and the use of teletype machines, which did not require their operators to know Morse Code.
But a major breakthrough in this field came when unique combination of voice and electricity led to actual invention of telephone by Graham Bell in 1876. He then got his patent issued for Improvements in Telegraph in the same year.ut a major breakthrough in this field came when unique combination of voice and electricity led to actual invention of telephone by Graham Bell in 1876. He then got his patent issued for Improvements in Telegraph in the same year.