How long has millimeter wave technology been around for?

On December 17th 1902, the first successful trans-atlantic transmission via radio took place. The introduction of using RF signals to carry communications sparked a revolution in human communication. On June 21, 1943, the United States Supreme Court reversed itself, granting patent rights to Tesla, not Marconi, for the invention of radio. This was on account of Marconi's use of 17 of Tesla's patents to achieve his first transatlantic transmission.   As the radio technology blossomed in the 20th