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.
Western Union Telegraph Company bought the quadruplex in 1874, financing Edison's dream of opening up an Invention Factory, which he did in Menlo Park, New Jersey. Edison's Menlo Park years were his most productive and profitable.dison tinkered with Morse's telegraph for years, finally inventing a quadruplex telegraph system. This system served two purposes: It sent two messages over the same wire in opposite directions simultaneously, and saved telegraph companies money by sending multiple messages on less equipment.