Match these milestones in communication history with their correct dates. 1. telegraph 2. telephone 3. radio 4. computer 5. television 6. computer networking 7. internet

Milestones in history of communication:In France, from the year 1793 to the year 1846, “Optical Telegraph” was invented by “Claude Chappe”. In 1876, Alexander Graham Bell was given the patent for the invention of the telephone. The first radio waves were identified and studied by Heinrich Hertz in 1886. Later in 1895, radio transmitters and radio receivers were developed by Italian Marconi. The units of frequency were named after Heinrich Hertz as Hertz. Around 1900, the radio was commercially used. According to Derek J, an Analog Computer was invented in 1901 that was designed to calculate the astronomical positions. Television was invented in 1920s in crude experimental form. Later new technologies were added to get the updated versions. The network of Computers is invented in the late 1950s in the US military radar system. Internet marked the transition to the modern world in the early 1990's.