1893, nikola tesla publicly demonstrated radio communication for the first time in St. Louis, Missouri, USA. He described and demonstrated the basic principles of radio communication in the reports of Franklin College in Philadelphia and the National Electric Light Association. The instrument he made contains all the basic components of the radio system before the invention of the electron tube.
Guillermo Marconi holds the British patent number, which is widely regarded as the world's first patent on radio technology. 12039, "improvement of electric pulse and signal transmission technology and required equipment".
Nikola tesla 1897 obtained the patent of American radio technology. However, in 1904, the US Patent Office revoked its patent right and granted Marconi a patent for inventing radio instead. This move may be influenced by Marconi's economic supporters in the United States, including Edison and andrew carnegie. 1909, Marconi and karl ferdinand braun won the Nobel Prize in Physics for their contribution to the invention of wireless telegraph.
1943, shortly after Tesla's death, the US Supreme Court re-affirmed Tesla's patent. This decision admitted that his invention had been completed before Marconi's patent. Some people think that this decision is obviously for economic reasons. In this way, the US government in World War II can avoid paying Marconi patent royalties.