Alexander Graham Bell was a Scottish-born American inventor famous for the invention of the telephone. He died on August 2, 1922. On the day that Alexander Graham Bell was buried, millions of phones in America and Canada went dead for one minute as a mark of respect for the inventor.
Prof. Henrich Focke, a German inventor, devised the first practical helicopter called the Focke-Wulf Fw 16, which was successfully flown in 1936. By 1938 it set many world records for altitude, speed and flight duration. It could be flown by a pilot after only one hour of pilot briefing.
