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.
Quick Answer. The United States Patent Office issued patent #174,465 to Alexander Graham Bell on March 7, 1876, for his device that could transmit speech electrically: the telephone. On March 10, Mr. Bell spoke the first intelligible words into the device: Mr. Watson, come here, I want to see you.. Continue Reading.