Title: Lee de Forest
Description: The life and work of Lee de Forest,  predominantly in the first three decades of the 20th century, when he invented the Audion amplifier tube, was at the forefront of radio broadcasting, and helped integrate sound and motion pictures.
Subjects: inventing, patents, radio, sound motion pictures, Mathematics, Performing arts, Humanities, Science, Multimedia systems, Engineering, History
Places: Hollywood, Los Angeles, San Francisco, Yale
People: Edwin Armstrong, Theodore Case, Thomas Edison
Time periods: 1870-1960, 1900-1940