The Distributed Flight Array (DFA) has been developed by a team of researchers at the Institute for Dynamic Systems and Control (IDSC) at ETH Zürich university in Switzerland. Each robot has a 3D-printed hexagonal plastic chassis with magnets fixed to the sides of the frame and a single propeller fitted in the middle.
Granville T. Woods certainly was an African American inventor who had at least 50 government patents on his many inventions. More than a dozen of these patents were inventions for electric railways but most of them were focused on electrical control and distribution. His most remarkable invention, however, was the induction telegraph, a system for communicating to and from moving trains. Many referred to Granville T. Woods as the black Thomas Edison.