Harold Stephen Black

Born: 1898
Birthplace: Leominster, Mass.

Negative feedback amplifier—Black's negative feedback concept involved feeding systems output back to the input as a method of system control thus helping to eliminate distortion in telecommunications and to extend the frequency range of the amplifier. (1981)

Died: 1983

Clarence BirdseyeThe National Inventors Hall of FameSamuel Blum