Before revision: Edwin Howard Armstrong (December 18, 1890 – February 1, 1954) was an American electrical engineer and inventor , who developed FM (frequency modulation) radio and the superheterodyne receiver system.
After revision: Edwin Howard Armstrong (December 18 1890 – February 1, 1954) was an American electrical engineer and inventor , who developed FM (frequency modulation) radio and the superheterodyne receiver system.